List of Castle episodes

Castle is an American comedy-drama police procedural television series on ABC which was created by Andrew W. Marlowe. It stars Nathan Fillion as Richard Castle, a famous mystery novelist, and Stana Katic as NYPD detective Kate Beckett.

The show premiered as a midseason replacement on March 9, 2009. ABC renewed Castle for a second season with an initial order of 13 episodes; ABC later extended the order to 22, then 24 episodes. The second season premiered on Monday, September 21, 2009. In March 2010, ABC renewed Castle for a third, 22 episode season, which began on September 20, 2010, and was extended to 24 episodes. The fourth season premiere aired on Monday, September 19, 2011. On December 8, 2011, ABC ordered an additional episode bringing season 4 up to 23 episodes. On May 10, 2012 the show was renewed for a fifth season, which premiered on September 24, 2012, and was extended with an additional order of two episodes, bringing the total to 24 for the season. The sixth season of Castle premiered on September 22, 2013 in Canada and September 23, 2013 in the US.

Series overview

Season		Episodes	Originally aired		DVD release date
			Season premiere	Season finale	Region 1	Region 2	Region 4
	1	10	March 9, 2009 (2009-03-09)	May 11, 2009 (2009-05-11)	September 22, 2009 (2009-09-22)	May 6, 2010 (2010-05-06)	March 9, 2010
	2	24	September 21, 2009 (2009-09-21)	May 17, 2010 (2010-05-17)	September 21, 2010	March 24, 2011 (2011-03-24)	December 1, 2010 (2010-12-01)
	3	24	September 20, 2010 (2010-09-20)	May 16, 2011 (2011-05-16)	September 20, 2011	August 6, 2012	October 12, 2011
	4	23	September 19, 2011 (2011-09-19)	May 7, 2012 (2012-05-07)	September 11, 2012	November 14, 2012	November 14, 2012
	5	24	September 24, 2012 (2012-09-24)	May 13, 2013 (2013-05-13)	September 10, 2013	November 11, 2013	November 6, 2013
	6	23	September 23, 2013 (2013-09-23)	May 12, 2014 (2014-05-12)	TBA	TBA	TBA

Episode list

Season 1 (2009)

No. by series	No. by season	Title	Directed by	Written by	Original air date	Production number	U.S. viewers (in millions)
1	1	"Flowers for Your Grave"	Rob Bowman	Andrew W. Marlowe	March 9, 2009 (2009-03-09)	101	10.76
When a young woman is found dead under circumstances described exactly in a book written by acclaimed author Richard Castle, he is brought in to provide insight into the case. When more victims turn up in similarly-accurate conditions described in his books, Castle is enlisted to assist the investigation by applying his knowledge of criminal behavior and his own books to the department's considerable skills. It turns out that the killer is actually the brother of one of the victims, only killing the others because he wanted it to look like a crazy fan killed those people. Over the period of this case Castle becomes intrigued with Detective Beckett and starts writing a manuscript about a character based on her.
2	2	"Nanny McDead"	John Terlesky	Barry Schindel	March 16, 2009 (2009-03-16)	103	10.97
The body of a nanny stuffed into an apartment building clothes dryer sets off a convoluted investigation into the hows and whys of her death. Castle, now a part of the detective team through an arrangement with the mayor, lends his skills of envisioning scenarios and pointing out seemingly-unrelated details—not to mention unorthodox methods—to the investigation.
3	3	"Hedge Fund Homeboys"	Rob Bowman	David Grae	March 23, 2009 (2009-03-23)	104	9.14
The shooting death in Central Park of a boy from a rich family sends Castle and Beckett into the world of New York private academies, where circles of friends prove to be almost more conniving, evasive, and mysterious than they can fathom.
4	4	"Hell Hath No Fury"	Rob Bowman	Andrew W. Marlowe	March 30, 2009 (2009-03-30)	102	9.09
When a prominent politician is murdered, the Department finds itself under intense pressure from the city government to explain what happened. However, the squeaky-clean politician had another side he had kept carefully hidden from the public.
5	5	"A Chill Goes Through Her Veins"	Bryan Spicer	Charles Murray	April 6, 2009 (2009-04-06)	105	9.03
The discovery of a hard-frozen body at a construction site leads the investigation of her death into unsolved cases from years past, tangling Beckett and Castle's case with a missing-persons case that was closed but never really solved.
6	6	"Always Buy Retail"	Jamie Babbit	Gabrielle Stanton & Harry Werksman	April 13, 2009 (2009-04-13)	107	7.73
Someone is not just killing, but doing so ritualistically. Castle's knowledge of obscure rituals points to someone conducting a findsman's ritual; whatever he or she is doing, it is obvious that something has been lost and they want it back. However, trying to find the truth amidst illegal immigrants and confusing facts tests the abilities, and imaginations, of the team.
7	7	"Home is Where the Heart Stops"	Dean White	Will Beall	April 20, 2009 (2009-04-20)	106	8.21
When a member of New York's high society is found murdered and stuffed into a small wall safe, the Department is put under pressure to get to the bottom of the story. But to get the answers to the string of robbery/murders, places must change; rather than Castle visiting New York's dark alleys, Beckett must follow him into the world of glitz, glamor, and, ultimately, murder, after they discover that the robberies are only connected by the victims having attended a specific charity event.
8	8	"Ghosts"	Bryan Spicer	Moira Kirland	April 27, 2009 (2009-04-27)	108	8.24
While unusual circumstances are practically usual, a body drowned in a bathtub of motor oil has the team scratching its collective head. The mystery deepens when investigation shows that the victim may have been involved with a crime more than 20 years old and was working with (or being stalked by) a true crime writer, and the relationship between Castle and Beckett finally rears its truly competitive head during a poker game involving New York's legal system elite.
9	9	"Little Girl Lost"	John Terlesky	Elizabeth Davis	May 4, 2009 (2009-05-04)	109	9.97
The disappearance of a young child has the team scrambling for answers when additional help arrives in the form of FBI agent Will Sorenson (Bailey Chase) who, among other things, is an ex-boyfriend of Beckett's. As Castle butts in on the investigation despite instructions to stay out, friction is inevitable—particularly since the case that first brought Beckett and Sorenson together ended with the death of the victim.
10	10	"A Death in the Family"	Bryan Spicer	Story by: Andrew W. Marlowe & Barry Schindel Teleplay by: Andrew W. Marlowe	May 11, 2009 (2009-05-11)	110	9.96
The gruesome murder of a plastic surgeon sends Castle and Beckett into a confusing world of cosmetic surgery, unstable patients, and the witness protection program. Castle begins looking into the death of Johanna Beckett, and discovers that her murder might not have been as random as first thought—Johanna was killed by a hitman.

Season 2 (2009–10)

No. by series	No. by season	Title	Directed by	Written by	Original air date	Production number	U.S. viewers (in millions)
11	1	"Deep in Death"	Rob Bowman	Andrew W. Marlowe	September 21, 2009 (2009-09-21)	201	9.26
Beckett is still annoyed at Castle for looking into her mother's murder against her wishes, yet Captain Montgomery forces her to chat with a reporter who is jazzed to write about her crime-solving partnership with Castle. But when a murder victim is found hanging in a tree, Beckett reluctantly teams with Castle once again. Their investigation takes a strange turn when armed men kidnap the body en route to the coroner, leaving Castle and Beckett to delve into the world of drug smuggling, the Russian mob and high stakes poker in Chinatown.
12	2	"The Double Down"	Rob Bowman	David Grae	September 28, 2009 (2009-09-28)	204	9.15
When Castle and Beckett are handed the murder of a couples therapist and Ryan and Esposito are assigned to investigate the death of a dead man found shot in a park, Castle makes a bet on which pair can solve their murder first. But when both investigations hit dead ends and the victims are found to be strangely connected, the two teams work together to solve the peculiar puzzle.
13	3	"Inventing the Girl"	Dwight Little	Moira Kirland	October 5, 2009 (2009-10-05)	202	9.23
When Jenna McBoyd, a young, up-and-coming model is found stabbed with a strange object in a fountain, Castle and Beckett are forced to explore the cut throat world of fashion modeling. Meanwhile, Alexis reconnects with her old baby-sitter, and Ryan and Esposito discover an amusing secret about Beckett.
14	4	"Fool Me Once..."	Bryan Spicer	Alexi Hawley	October 12, 2009 (2009-10-12)	203	9.77
While dropping playful hints to Beckett about the plot of Castle's first book based on her, the two investigate the murder of a con man posing as an Arctic explorer for school children. The case takes several interesting turns, fascinating Castle and infuriating Beckett, when they suspect that the victim was actually a CIA operative and may have faked his own death. But when an old CIA contact of Castle's disputes that the victim was ever a spy, everyone wonders just who is being fooled.
15	5	"When the Bough Breaks"	John Terlesky	René Echevarria	October 19, 2009 (2009-10-19)	205	9.69
A woman who is an illegal immigrant is found dead in a manhole, prompting Castle and Beckett to uncover a dark secret about a successful doctor, and a possible connection between his son, and that of the victim. At the same time, Castle's first book based on Beckett, Heat Wave, is released to rave reviews, and he is offered the writing opportunity of a lifetime, causing him to struggle with the fact that accepting the new gig would end his partnership with Beckett.
16	6	"Vampire Weekend"	Karen Gaviola	Terri Miller	October 26, 2009 (2009-10-26)	206	9.99
As Halloween approaches, Castle and Beckett are assigned to investigate the death of a young man found stabbed in the heart with a wooden stake in a graveyard. To Castle's delight, the two must delve into the world of vampires and werewolves to find the killer. The opening scene has a reference to Firefly, with Castle dressing up similar to Malcolm Reynolds (Fillion's character in Firefly) and saying he is dressed as a space cowboy.
17	7	"Famous Last Words"	Rob Bowman	Jose Molina	November 2, 2009 (2009-11-02)	207	9.43
Castle and Beckett investigate the murder of a singer in a popular punk band whose body was arranged to resemble a scene in one of the band's music videos. When the case stumps the two, Alexis comes to their aid, using knowledge gained as a fan of the band.
18	8	"Kill the Messenger"	Jonathan Frakes	Terence Paul Winter	November 9, 2009 (2009-11-09)	208	9.82
The investigation into the death of a bike messenger takes a personal turn for Beckett and her colleagues when they discover that the victim was carrying evidence that could exonerate a man jailed years before by Captain Montgomery. Things get even more interesting when they discover that a wealthy candidate for the U.S. Senate from a prominent New York family may have been involved as well.
19	9	"Love Me Dead"	Bryan Spicer	Alexi Hawley	November 16, 2009 (2009-11-16)	209	10.53
Castle and Beckett are thrust into the world of ex-cons and escorts after a respected Assistant District Attorney is tossed off a multi-story car parking garage. Further, Castle sympathizes with the plight of a call girl connected to the case, resulting in his making promises that he and Beckett may not be able to keep. Meanwhile, Castle is concerned, and mildly hurt, when Alexis confides a secret to Beckett and not to him.
20	10	"One Man's Treasure"	Helen Shaver	Elizabeth Davis	November 23, 2009 (2009-11-23)	210	10.31
Castle and Beckett have their hands full looking into the death of a man whose body is found stuffed in a garbage chute when two women arrive to identify the body—one claiming to be the victim's wife, the other his fiancée. Meanwhile, Alexis volunteers at the precinct as part of a civics class project, and works to track down the owner of a packet of photos left over from a case gone cold years ago.
21	11	"The Fifth Bullet"	John Terlesky	David Grae	December 7, 2009 (2009-12-07)	211	7.80
A twist arises in the case of an art dealer found shot to death in his art gallery when a man with amnesia arrives at the station carrying a book with a bullet lodged in it that was fired from the same gun as was used in the murder. To solve the crime, Castle and Beckett have to jog his memory and unravel a possible connection to a high-level Arabian diplomat.
22	12	"A Rose for Everafter"	Bryan Spicer	Story by: Alexi Hawley Teleplay by: Terri Miller & Terence Paul Winter	January 11, 2010 (2010-01-11)	212	9.47
Castle reconnects with a former girlfriend (Alyssa Milano) on her wedding day when one of her bridesmaids is found murdered, causing sparks to fly between them once again, and Beckett to have to deal with the possibility of being jealous.
23	13	"Sucker Punch"	Tom Wright	Will Beall	January 18, 2010 (2010-01-18)	213	9.45
The case of the murder of an enforcer for an Irish gang takes a personal turn when Lanie and a forensic expert friend of Castle's uncover an undeniable connection between the case and Beckett's mother's unsolved murder. The trail leads to Dick Coonan, a philanthropist by day and an assassin known as "Wrathborne" by night. Coonan murdered Johanna Beckett, but he takes Castle hostage and Beckett is forced to shoot him before she can learn who paid him to kill her mother.
24	14	"The Third Man"	Rosemary Rodriguez	Terence Paul Winter	January 25, 2010 (2010-01-25)	214	10.55
As Castle and Beckett investigate the death of a possible serial squatter mixed up in a multi-million dollar heist involving exotic animals and diamonds, Castle tries to hide from Beckett the fact that a newspaper that ranked him as one of the city's most eligible bachelors also linked them romantically. While Castle relishes the moment by agreeing to a date with a woman ranked by the newspaper as one of the city's most eligible bachelorettes, Beckett makes romantic plans of her own with Lanie's help.
25	15	"Suicide Squeeze"	David Barrett	Jose Molina	February 8, 2010 (2010-02-08)	215	9.54
A beloved Cuban baseball player is found murdered with a baseball bat requiring Castle and Beckett to explore the high-stakes world of professional sports. Meanwhile, Alexis works to complete a family tree for school and questions Castle about his desire to know more about his own father.
26	16	"The Mistress Always Spanks Twice"	Tom Wright	Kate Sargeant	March 8, 2010 (2010-03-08)	216	9.11
The body of a woman covered in caramel sauce is found hanging from playground equipment in a park, prompting the team to venture into the world of bondage and fetish clubs, and plenty of playful banter between Castle and Beckett.
27	17	"Tick, Tick, Tick..."	Bryan Spicer	Moira Kirland	March 22, 2010 (2010-03-22)	217	12.21
(Part 1) Beckett and Castle team up with experienced FBI Special Agent Jordan Shaw (Dana Delany) in the hunt for a serial killer with an apparent obsession for 'Nikki Heat', the character Castle based on Beckett in his best-seller Heat Wave. It soon becomes apparent that not only is Beckett jealous of Castle's admiration for Shaw and the FBI's hi-tech gadgets, but that Beckett herself could be the killer's ultimate intended victim. Castle also strikes a deal to make Heat Wave into a movie.
28	18	"Boom!"	John Terlesky	Elizabeth Davis	March 29, 2010 (2010-03-29)	218	14.50
(Part 2) After barely surviving an explosion that destroys her apartment, set by the serial killer, now identified as Scott Dunn, Beckett pushes Shaw's imposed boundaries on her involvement in the investigation, and gets herself removed from the case. But when Dunn kidnaps Shaw to get to Beckett, Beckett takes over the investigation and finds herself relying on Castle's instincts as a mystery writer to save Shaw and herself.
29	19	"Wrapped Up in Death"	Bill Roe	Alexi Hawley	April 5, 2010 (2010-04-05)	219	11.70
When a museum curator is found dead from having a stone gargoyle dropped on him, Beckett, Castle, and the team must answer the question of whether the killer is a jealous colleague, a jilted lover, the publicity-hungry museum director, or the curse of an ancient mummy whose tomb promises death for anyone who looks upon its face, as Castle couldn't resist doing.
30	20	"The Late Shaft"	Bryan Spicer	David Grae	April 12, 2010 (2010-04-12)	220	12.68
When a legendary talk show host (Tom Bergeron) is found dead after Castle appears on his show and he reveals to Castle that his life is in danger, Castle and Beckett work to piece together a timeline of his final hours that could crack the case even though it seems the victim died of natural causes. Meanwhile, Castle's fling with an actress, who is up for the part of Nikki Heat in the movie version of Heat Wave, has Beckett jealous.
31	21	"Den of Thieves"	John Terlesky	Will Beall	April 19, 2010 (2010-04-19)	221	10.39
An investigation into the death of a thief uncovers some painful parts of Esposito's past and results in Beckett making a connection with the handsome robbery detective, Tom Demming (Michael Trucco), assigned to help with the case.
32	22	"Food to Die For"	Ron Underwood	Terri Miller	May 3, 2010 (2010-05-03)	222	10.69
Castle and Beckett's investigation into the murder of a chef who recently won a reality cooking show results in her reconnecting with an old high school friend, Madison Queller, who owned the restaurant where the victim worked. While Beckett's relationship with Demming develops, Castle pursues Madison, but whether for romance or information on Beckett's past for one of his books isn't clear.
33	23	"Overkill"	John Terlesky	René Echevarria	May 10, 2010 (2010-05-10)	223	10.86
Beckett asks Demming to help her and Castle investigate a robbery-homicide, prompting the two men to fall into competition with each other to impress Beckett by proving their own theory in the death correct. As the case develops, it becomes obvious to Castle that, despite his efforts at solving the case, Beckett's relationship with Demming has gotten serious.
34	24	"A Deadly Game"	Rob Bowman	Andrew W. Marlowe	May 17, 2010 (2010-05-17)	224	10.07
The death of a man who was involved in a simulated spy game leads Castle and Beckett to wonder where exactly the game ends and reality begins. Against this backdrop, Castle and Beckett struggle inwardly with their feelings for each other, even though Beckett is officially dating Demming and Castle is severely behind in his writing for the second Nikki Heat book. After receiving advice from family and friends, both come to separate decisions that could make or break their relationship in the future.

Season 3 (2010–11)

No. by series	No. by season	Title	Directed by	Written by	Original air date	Production number	U.S. viewers (in millions)
35	1	"A Deadly Affair"	Rob Bowman	Andrew W. Marlowe	September 20, 2010 (2010-09-20)	301	10.70
Beckett and her team burst into an apartment on a murderer's trail, only to be surprised when they find Castle, whom they had not seen or heard from in months, standing over the dead woman's body holding a gun. Beckett has no choice but to arrest Castle until he proves he is innocent.
36	2	"He's Dead, She's Dead"	John Terlesky	Moira Kirland	September 27, 2010 (2010-09-27)	303	11.08
Beckett and Castle look for a killer of a famous psychic while debating whether extrasensory abilities are real or fake. But, when a letter arrives from the victim predicting her death, they must determine who actually wrote the letter, the victim or the killer.
37	3	"Under the Gun"	Bryan Spicer	Alexi Hawley	October 4, 2010 (2010-10-04)	302	10.83
While investigating the murder of a bail bondsman, Beckett and Castle run into Beckett's first Training Officer, Mike Royce, now working as a bounty hunter and chasing their murder suspect on a warrant for missing his court appearance.
38	4	"Punked"	Rob Bowman	David Grae	October 11, 2010 (2010-10-11)	304	10.66
Beckett and Castle investigate a murder of a young executive involving antique guns, a 200-year-old bullet, and New York's steampunk subculture. Later, a new romance in Beckett's life is revealed.
39	5	"Anatomy of a Murder"	John Terlesky	Terence Paul Winter	October 18, 2010 (2010-10-18)	305	10.95
When a County Hospital doctor's body is discovered in someone else's casket, Castle and Beckett dive into the complex relationships in the hospital and the doctor's life to uncover the killer. Meanwhile, Castle's relationship with his ex-wife is strained over a pair of concert tickets.
40	6	"3XK"	Bill Roe	David Amann	October 25, 2010 (2010-10-25)	307	11.32
When a woman's dead body shows signs of an old killer's handiwork, Castle and Beckett discover that the Triple Killer, a murderer who vanished four years previously, may have returned. Meanwhile, Castle alternately encourages and discourages Alexis' involvement with a secret admirer.
41	7	"Almost Famous"	Félix Alcalá	Elizabeth Davis	November 1, 2010 (2010-11-01)	306	11.27
Beckett and Castle respond to an "Officer Down" call only to find that the murdered "officer" is actually a male stripper wearing a police costume.
42	8	"Murder Most Fowl"	Bryan Spicer	Matt Pyken	November 8, 2010 (2010-11-08)	308	10.83
Beckett and Castle discover the brutal kidnapping of a boy while investigating the shooting death of a subway worker in Central Park. Meanwhile, Alexis plays pet-sitter for an aged rat.
43	9	"Close Encounters of the Murderous Kind"	Bethany Rooney	Shalisha Francis	November 15, 2010 (2010-11-15)	309	9.98
When a prominent astrophysicist is found dead in her car of explosive decompression, Castle is led to theorize her death was the result of an alien abduction, particularly when a government agent (Lyle Lovett) tries to stop the investigation.
44	10	"Last Call"	Bryan Spicer	Scott Williams	December 6, 2010 (2010-12-06)	310	7.63
Castle and Beckett investigate the murder of a dockworker turned bar owner whose body is found floating in the East River, leading to the discovery of a secret that dates back to Prohibition.
45	11	"Nikki Heat"	Jeff Bleckner	David Grae	January 3, 2011 (2011-01-03)	312	9.61
Natalie Rhodes (Laura Prepon), playing Nikki Heat in the film adaptation of Heat Wave, joins Castle and Beckett in their next investigation of a high class match-maker, Stacy Collins. Natalie goes to extremes during her "character research," making herself into the exact image of Beckett, much to Castle's delight and Beckett's dismay. Ryan tries to find the best way to propose to Jenny.
46	12	"Poof! You're Dead"	Millicent Shelton	Terri Miller	January 10, 2011 (2011-01-10)	311	9.05
Beckett and Castle are called to investigate the murder of a magician, found suspended upside down in a tank of water. The trail leads back to a money laundering scheme and an investigation into a questionable billionaire whose plane exploded over the Atlantic. Meanwhile, Lanie and Esposito try to keep a secret from the rest of the 12th Precinct and Castle struggles with his feelings for his ex-wife Gina.
47	13	"Knockdown"	Tom Wright	Will Beall	January 24, 2011 (2011-01-24)	313	9.08
When the detective who investigated Beckett's mother's murder is shot before her eyes before he can give her new evidence in the case, Beckett's old wounds are reopened. The investigation of the detective's death leads the team to a group of three corrupt cops who were kidnapping mobsters for ransom until they accidentally shot and killed an undercover FBI agent. Johanna Beckett discovered the scheme while researching an appeal on behalf of the mobster who was charged with the death of the dead agent.
48	14	"Lucky Stiff"	Emile Levisetti	Alexi Hawley	February 7, 2011 (2011-02-07)	314	9.26
Castle and Beckett are called to look into the murder of a winner of 117 million dollars in the lottery who was found dead in his apartment and the safe containing his winnings empty. As they look into the victim's past spendings and charity, discovering he was trying to make up for the mistakes he made. Martha meanwhile has inherited a million dollars from her former partner Chet and wants to find some way to honor his memory.
49	15	"The Final Nail"	John Terlesky	Moira Kirland	February 14, 2011 (2011-02-14)	315	8.75
Beckett and Castle are called to investigate the murder of a wealthy woman, killed by a nail gun. Castle went to boarding school with the victim's husband, Damien Westlake (Jason Wiles). While Beckett considers Castle's old friend the prime suspect, Castle disagrees. Their investigation leads them to a cold case: the murder of Philip Westlake (Damien's father) that occurred two decades ago.
50	16	"Setup"	Rob Bowman	David Amann	February 21, 2011 (2011-02-21)	316	8.99
(Part 1). Castle and Beckett Investigate the murder of a New York taxi driver who was shot to death, and his taxi stripped of its parts. As they search for his killer, they are led to a storage with trace amounts of radioactive material and evidence that there may be a terrorist group building a dirty bomb. Beckett and the squad must cooperate with a ruthless Homeland Security agent Mark Fallon (Adrian Pasdar), but Castle senses that they have been set up. As Castle and Beckett close in on a suspect, they are trapped in a freezer while a nuclear device is loose in the city.
51	17	"Countdown"	Bill Roe	Andrew W. Marlowe	February 28, 2011 (2011-02-28)	317	10.11
(Part 2). Castle and Beckett remain trapped in the frozen storage container while the NYPD and the Department of Homeland Security continue to search for the dirty bomb. Alexis' worried call finally results in help arriving, including Beckett's boyfriend, Josh. Now back on the task force, Beckett and Castle team up with Homeland Security, to follow the trail of domestic terrorists.
52	18	"One Life to Lose"	David M. Barrett	Elizabeth Davis	March 21, 2011 (2011-03-21)	318	12.03
When Sarah Cutler, the head writer on one of New York's longest running soap operas, is killed with a fire axe, Castle and Beckett quickly discover behind the scenes drama just as scandalous as the fictitious storylines, and most would kill to get ahead.
53	19	"Law & Murder"	Jeff Bleckner	Terence Paul Winter	March 28, 2011 (2011-03-28)	319	12.56
During the trial of a murdered socialite, a juror falls dead from cyanide poisoning. Suspect number one is the defendant of the trial, having an accomplice poison the juror's coffee within the courthouse. But when Castle and Beckett discover that the victim was poisoned long before he reached the courthouse, they begin to follow a trail that involves the victim buying his way into the trial and his connection to the case being presented in the courtroom.
54	20	"Slice of Death"	Steve Boyum	Scott Williams	April 4, 2011 (2011-04-04)	320	11.45
When a reporter is found dead inside a pizza oven, Castle and Beckett try to determine why he was murdered. They hunt a trail of suspects working for franchises with very similar names. Meanwhile, Alexis has problems to cope with when a "friend" tries to steal her boyfriend.
55	21	"The Dead Pool"	Paul Holahan	Matt Pyken	April 11, 2011 (2011-04-11)	321	12.33
When a future Olympic swimmer is found dead in the pool, Castle and Beckett travel into the world of sports, drugs, and drug dealers.
56	22	"To Love and Die in L.A."	John Terlesky	Alexi Hawley	May 2, 2011 (2011-05-02)	322	12.11
Against orders, Beckett travels to Los Angeles while investigating the murder of her training officer Michael Royce, last seen being arrested in the episode "Under the Gun"; Castle questions Beckett's motives.
57	23	"Pretty Dead"	Jeff Bleckner	Terri Miller	May 9, 2011 (2011-05-09)	323	12.60
Castle and Beckett are called to investigate when Amber Middleberry, a contestant in a beauty pageant, is found strangled and every suspect has a motive to commit murder.
58	24	"Knockout"	Rob Bowman	Will Beall	May 16, 2011 (2011-05-16)	324	12.93
An assassin with knowledge of the details behind Beckett's mother's murder escapes from custody during his arraignment, leaving Castle and Beckett to track him down. Secrets are revealed about Captain Montgomery's past as the third cop. Montgomery leaves evidence of the involvement of a powerful third party in the case for Beckett, before confronting the assassins. He is shot and killed in the process. At Montgomery's funeral, Beckett is shot in the chest by a sniper. Castle tells her that he loves her as he holds her in his arms just before her eyes close.

Season 4 (2011–12)

On January 10, 2011, ABC announced that Castle had been renewed for a fourth season. Penny Johnson Jerald joins the cast as the new captain, Victoria "Iron" Gates.

No. by series	No. by season	Title	Directed by	Written by	Original air date	Production number	U.S. viewers (in millions)
59	1	"Rise"	Rob Bowman	Andrew W. Marlowe	September 19, 2011 (2011-09-19)	401	13.28
After undergoing extensive surgery, Beckett takes three months to recuperate before returning to the NYPD. With Castle in tow she begins searching for her would-be assassin. Captain Montgomery is replaced by Captain Victoria "Iron" Gates, who does not approve of Castle's presence. Although Beckett at first claims that she does not remember the events of the gunshot, she confesses to a psychologist that she does. As Castle tries to dissuade Beckett from digging deeper into the case, he himself is immersed in the process of trying to identify Beckett's shooter.
60	2	"Heroes & Villains"	Jeff Bleckner	David Amann	September 26, 2011 (2011-09-26)	402	11.67
Castle and Beckett investigate the murder of an ex-con in an alley, and believe a superhero-themed vigilante is behind the murder but the case gets complicated as they find out that there is more than one person dressed up as the same comic book hero.
61	3	"Head Case"	Holly Dale	David Grae	October 3, 2011 (2011-10-03)	403	11.18
Castle and Beckett investigate a crime scene that involves a large pool of blood, but no victim. The victim had a cryogenics contract, triggered by an alarm which goes off when the victim's heart stops beating. Taking the bullet out would 'kill' the corpse, so the severed head remains frozen and at the cryogenics laboratory. When Ryan and Esposito find needles with the victim's brain matter on it, the case takes a turn when Lanie discovers that someone was doing procedures to the victim's head. Alexis receives news about Stanford.
62	4	"Kick the Ballistics"	Rob Bowman	Moira Kirland	October 10, 2011 (2011-10-10)	404	10.23
Castle and Beckett investigate the murder of a young woman which was committed using Det. Ryan's old service weapon – the one that was stolen by the serial killer, 3XK. The victim's phone records reveal she had been in contact with Seth Carver, an undercover narcotics detective. When looking through old police records, Castle manages to find a link in the case which leads them to Philip Lee, the son of Clifford Lee, a notorious Chinese drug mobster.
63	5	"Eye of the Beholder"	John Terlesky	Shalisha Francis	October 17, 2011 (2011-10-17)	405	11.23
Castle and Beckett investigate a murder committed during the theft of a valuable sculpture. Serena Kaye, a smart, sexy insurance investigator, joins them in the investigation, all the while hiding a very important secret from the team. She also attracts a lot of attention from Castle, with mixed feelings from Beckett.
64	6	"Demons"	Bill Roe	Rob Hanning	October 24, 2011 (2011-10-24)	406	10.81
Castle and Beckett investigate the murder of a ghost hunter named Jack Sinclair who was looking into a haunting at a New York mansion. As they delve deeper into the case, Castle supports the idea that supernatural powers could be at work, while Beckett looks for a non-supernatural reason for the murder. While looking at the haunted mansion, Castle and Beckett discover a secret alcove where the killer killed Jack Sinclair, putting Castle's "demon" theory to rest.
65	7	"Cops & Robbers"	Bryan Spicer	Terence Paul Winter	October 31, 2011 (2011-10-31)	407	12.58
Martha and Castle are held hostage by bank robbers dressed in hospital scrubs. Beckett's rescue efforts are hindered by a strict hostage negotiator. Meanwhile, Alexis faces problems in her relationship with Ashley.
66	8	"Heartbreak Hotel"	Bill Roe	Elizabeth Davis	November 7, 2011 (2011-11-07)	408	11.07
During the investigation of the murder of an Atlantic City casino owner at an abandoned warehouse, strong leads emerge for the team in both New York and Atlantic City. As Beckett and Captain Gates work the New York leads together, Castle naturally chooses to join the detectives for the road trip to "America's Playground", hoping to help solve the case while throwing an impromptu bachelor party for Ryan.
67	9	"Kill Shot"	David M. Barrett	Alexi Hawley	November 21, 2011 (2011-11-21)	409	10.85
The team searches for a sniper who is terrorizing New York; Beckett tries to hide her worsening PTSD from Castle and the detectives.
68	10	"Cuffed"	John Terlesky	Terri Miller & Andrew W. Marlowe	December 5, 2011 (2011-12-05)	410	8.12
Castle and Beckett wake up handcuffed together in a sealed room, with no memory of how they got there. While Esposito and Ryan search for them, they must reconstruct their case from what little they remember.
69	11	"Till Death Do Us Part"	Jeff Bleckner	David Grae	January 9, 2012 (2012-01-09)	411	9.76
When Castle and Beckett investigate the death of a ladies' man, a secret is revealed about Ryan's bride.
70	12	"Dial M for Mayor"	Kate Woods	Christine Boylan	January 16, 2012 (2012-01-16)	412	9.41
A woman is found dead in the passenger seat of a car on loan from city hall by the Mayor (Derek Webster). Captain Gates urges Beckett to take Castle off the case due to his close friendship with the Mayor.
71	13	"An Embarrassment of Bitches"	Tom Wright	Rob Hanning	January 23, 2012 (2012-01-23)	413	10.05
The investigation into the death of a famous dog trainer leads to reality television star Kay Cappuccio (Hilarie Burton). Alexis goes on a trip with her friend Buttons to look at colleges. Castle and Beckett debate where the dog, Royal, of the deceased (who had no family) should stay. Esposito has a crush.
72	14	"The Blue Butterfly"	Chuck Bowman	Terence Paul Winter	February 6, 2012 (2012-02-06)	414	8.70
Castle attempts to solve a crime using a diary written in the 1940s. Every time he reads it he flashes back to the 1940s, with the principal characters being imagined as people described in the diary.
73	15	"Pandora"	Bryan Spicer	David Amann	February 13, 2012 (2012-02-13)	415	8.86
(Part 1) Castle and Beckett find out that the killer they are pursuing is part of an international conspiracy; Alexis starts a new internship assisting Lanie in the Medical Examiner's Office.
74	16	"Linchpin"	Rob Bowman	Andrew W. Marlowe	February 20, 2012 (2012-02-20)	416	9.73
(Part 2) Castle and Beckett realize what the linchpin is. In their attempts to prevent a war from breaking out, they are betrayed by someone they thought they could trust. Over the course of the investigation, Castle begins to learn more about his father.
75	17	"Once Upon a Crime"	Jeff Bleckner	Kate Sargeant	February 27, 2012 (2012-02-27)	417	9.10
When the bodies of two murdered women are found dressed as fairy tale characters, it falls to Castle and Beckett to catch a killer before he can strike again.
76	18	"A Dance with Death"	Kevin Hooks	Moira Kirland	March 19, 2012 (2012-03-19)	418	11.52
Castle and Beckett take the case of a troubled celebrity who was murdered moments before she was due to appear as a contestant on a popular dancing competition.
77	19	"47 Seconds"	Paul Holahan	Shalisha Francis	March 26, 2012 (2012-03-26)	419	11.87
Castle, Beckett and the NYPD scramble to find the perpetrator of a bombing at the "Takeover Wall Street" protest. While Beckett is interrogating a suspect, she reveals she has always remembered everything about her shooting, causing Castle (who inadvertently overhears) to think Beckett has rejected his feelings for her.
78	20	"The Limey"	Bill Roe	Elizabeth Davis	April 2, 2012 (2012-04-02)	420	11.69
Castle and Beckett are approached by a detective inspector named Colin Hunt (Brett Tucker) from Scotland Yard looking for help in solving the murder of a family friend. Beckett finally admits her feelings about Castle to Lanie, who convinces Beckett that she must make a move before it is too late.
79	21	"Headhunters"	John Terlesky	Alexi Hawley	April 16, 2012 (2012-04-16)	421	11.23
Feeling that he is no longer able to work with Beckett, Castle finds a new partner in Detective Ethan Slaughter (Adam Baldwin). As the two attempt to prevent a gang war from taking over New York, Slaughter's questionable and often violent methods place Castle's life in danger. Baldwin was Fillon's co-star on Firefly.
80	22	"Undead Again"	Bill Roe	Christine Boylan	April 30, 2012 (2012-04-30)	422	11.08
A witness to a murder claims that he and the victim were attacked by a zombie. Castle and Beckett take a step forward in their relationship, with Beckett stating that "Her wall" is about to come down.
81	23	"Always"	Rob Bowman	Terri Miller & Andrew W. Marlowe	May 7, 2012 (2012-05-07)	423	12.36
When Castle and Beckett attend the murder of a reformed gang member, they find evidence that links him to Beckett's shooting and the theft of documents from Roy Montgomery's home. The 12th Precinct is divided as Castle tries to stop Beckett from investigating, causing a rift in their partnership. Her efforts are unsuccessful, and Cole Maddox (Tahmoh Penikett)—her would-be assassin—escapes, vowing to kill her once he recovers Montgomery's files on his employer. Esposito and Beckett are suspended for withholding information on the case, however Beckett decides to resign. Beckett then goes to Castle's home where she finally gives in to her feelings for him, and they share a passionate kiss. The episode concludes with the mystery man protecting Kate, identified as Mr. Smith, being threatened by Maddox to give up the information he is using to blackmail them.

Season 5 (2012–13)

No. by series	No. by season	Title	Directed by	Written by	Original air date	Production number	U.S. viewers (in millions)
82	1	"After the Storm"	Rob Bowman	David Amann	September 24, 2012 (2012-09-24)	501	10.45
Castle wakes to find Beckett bringing him coffee in his bedroom. They agree sleeping together was not a one-time mistake and plan to spend the day in bed together, but are interrupted when Martha returns early to the apartment with a hung-over Alexis. Beckett is able to sneak out without being seen. Castle later arrives at Beckett's home, just minutes before Ryan arrives to discuss the Maddox/Smith case. Though she has just resigned, Beckett is drawn back into the investigation. They are able to link Maddox, Smith, and Senator William Bracken (Jack Coleman) together. Beckett deduces that Bracken was responsible for her mother's death and confronts him, threatening to release implicating information to the press should anything happen to her or anyone she cares about. Captain Gates allows Beckett to return to her job, but makes her complete her suspension.
83	2	"Cloudy with a Chance of Murder"	Kate Woods	Elizabeth Beall	October 1, 2012 (2012-10-01)	503	10.35
The team investigates the death of a television weather forecaster who had discovered that a local manufacturer was using styrene in its carpet-making process and releasing chemicals, causing asthma in local children. Meanwhile, when asked on a date live on-air by entertainment reporter Kristina Coterra (Jodi Lyn O'Keefe), Castle accepts in order to maintain the pretense that he and Beckett are still unattached; this goes horribly awry when Kristina tries to seduce Castle at his loft.
84	3	"Secret's Safe with Me"	John Terlesky	Terence Paul Winter	October 8, 2012 (2012-10-08)	502	10.61
A message scrawled in blood at a crime scene leads Castle and Beckett from a mysterious storage locker to the world of high society. Convinced that the storage locker holds a secret worth killing for, Castle finds evidence within that a socialite's butler was driving the car involved in a fatal hit-and-run accident. Meanwhile, Martha tells Castle that she knows about his relationship with Beckett and wants him to tell Alexis before she moves out of home and into her dorm room at Columbia.
85	4	"Murder, He Wrote"	Rob Bowman	David Grae	October 15, 2012 (2012-10-15)	505	10.94
Castle and Beckett plan a secret romantic weekend away in the Hamptons, but their trip turns sour when a dying man stumbles into their swimming pool. Castle is intrigued by the case and Beckett reluctantly follows his lead, knowing that they will not be able to enjoy their weekend until the crime is solved. The trail leads to a retired mobster, Vincent Cardono (Don Stark), a methamphetamine syndicate, and corruption in the police department. Meanwhile, Ryan and Esposito try to find out who Beckett's boyfriend is. Ryan discovers Castle and Beckett's relationship, but chooses not to reveal the secret.
86	5	"Probable Cause"	John Terlesky	Andrew W. Marlowe	October 29, 2012 (2012-10-29)	506	10.84
When investigating a brutal ritual killing, Beckett is horrified when the evidence leads her straight to Castle and she is forced to confront the idea that Castle may be capable of murder. As the evidence against him piles up, Castle orchestrates his own prison break when he learns he has been set up by Jerry Tyson, better known as the Triple Killer (3XK). As he becomes the target of a city-wide manhunt, Castle must stay alive long enough for Beckett to catch Tyson before Tyson catches him.
87	6	"The Final Frontier"	Jonathan Frakes	Kate Sargeant	November 5, 2012 (2012-11-05)	507	10.02
One of the fans of a cult science fiction television show is murdered at a fan convention, leaving Beckett and Castle caught between avid fans and celebrity egos. Suspicion turns on the cast of the original show when they learn that the victim was resisting plans to revive the series for modern audiences. This episode contains multiple references to Nathan Fillion's leading role in Firefly (referred to as "that Joss Whedon show"), a short-lived science fiction television show, that actually has reached cult status.
88	7	"Swan Song"	David M. Barrett	Rob Hanning	November 12, 2012 (2012-11-12)	504	10.07
When the body of an up-and-coming rock star is found with his skull bashed in by his favourite guitar, Castle and Beckett begin to probe tensions within his band and his connection to a fanatical religious cult. Meanwhile, a documentary crew that had been following the band around take an interest in their crime-solving partnership and gets permission to record the investigation, prompting everyone—except Beckett—to try to get as much publicity as they can by being the one to solve the case.
89	8	"After Hours"	David M. Barrett	Shalisha Francis	November 19, 2012 (2012-11-19)	508	10.48
Castle and Beckett are pursued by the mob when they are sent to escort the only witness to the murder of a priest into protective custody. Unarmed in the middle of a rough neighborhood and cut off from the 12th Precinct, they must use their wits to evade their pursuers long enough to piece together the evidence and find their one chance at surviving the night before their witness gets them all killed.
90	9	"Secret Santa"	Paul Holahan	Christine Roum	December 3, 2012 (2012-12-03)	509	8.50
When a bearded man in a red suit is found dead in the middle of Central Park, Castle and Beckett realize that they might just be investigating the murder of Santa Claus. As they dig deeper, they uncover a victim who was trying to make amends for a life of shady business deals that might have gotten him killed. Meanwhile, changes in everyone's personal lives spell the end for some Christmas traditions and the birth of new ones.
91	10	"Significant Others"	Holly Dale	Terence Paul Winter	January 7, 2013 (2013-01-07)	510	8.66
Beckett moves in with Castle while her home is being fumigated — at the same time as Castle's ex-wife Meredith moves in because Alexis has fallen ill. And to make it a perfect storm, their latest case is the murder of a high-powered divorce attorney with a reputation for representing jilted women. While Castle gets distracted by the thought of his ex-wife and his girlfriend living in close quarters, the trail of evidence leads them to the mysterious disappearance of a woman in the Caribbean.
92	11	"Under the Influence"	John Terlesky	Elizabeth Beall	January 14, 2013 (2013-01-14)	512	9.14
The release party of an aging pop star's comeback album is spoiled when a young disc jockey is found murdered nearby. As rival record producers war with one another, Castle and Beckett must brave an industry where music idols will do whatever it takes to enjoy another minute in the limelight.
93	12	"Death Gone Crazy"	Bill Roe	Jason Wilborn	January 21, 2013 (2013-01-21)	511	8.82
Beau Randolf, the founder of hit adult video franchise "College Girls Gone Crazy", is found strangled to death, sending Castle and Beckett headlong into the seedy world of pornography. While dealing with blackmailers, rival franchises and fervent protest groups, they discover an ambitious producer who will stop at nothing to keep the franchise alive.
94	13	"Recoil"	Tom Wright	Story by: Rob Hanning & Cooper McMains Teleplay by: Rob Hanning	February 4, 2013 (2013-02-04)	513	8.89
After years of waiting, Beckett finally gets her chance to take down Senator William Bracken, the man responsible for her mother's murder. Determined not to waste what might be her one and only shot at justice, she throws herself at the case—but Castle knows that there might be much greater forces at work, and that Beckett may not realize that she is in over her head until it is too late. As Beckett wrestles with the conflict between seeking her own personal revenge and her responsibility to see justice served, the 12th Precinct discovers that Bracken has become the target of an assassination and must do everything it can to save him. Once a suspect is taken into custody and the case is closed, Castle and Beckett find inconsistencies at the scene of the crime that suggest their suspect was framed, and that the person after Bracken is still at large and armed with a bomb.
95	14	"Reality Star Struck"	Larry Shaw	David Grae	February 11, 2013 (2013-02-11)	514	8.97
Beckett tries to solve the murder of a popular reality television star, but as she unravels a complicated web of relationships, she discovers that "reality" soon gets left behind in the endless pursuit of ratings. Meanwhile, Castle and Beckett fear that their relationship may be exposed to Gates when Castle's plan of giving a gift to Beckett goes sideways. This episode also stars Gina Torres, who was Fillion's co-star on Firefly.
96	15	"Target"	Bill Roe	David Amann	February 18, 2013 (2013-02-18)	515	9.85
In the first half of a two-part story, Castle and Beckett find themselves in a race against time when they unearth a plot to kidnap Sara el-Masri (Karen David), the daughter of a powerful foreign dignitary. The stakes are raised when they learn that Alexis was also kidnapped, and every lead they follow ends with the discovery of another dead body. Meanwhile, Alexis risks her own life to try to help her friend escape and quickly realises that her father will never find her in America because she has been taken out of the country.
97	16	"Hunt"	Rob Bowman	Andrew W. Marlowe	February 25, 2013 (2013-02-25)	516	10.77
Concluding the two-part story, Castle becomes frustrated with the search for Alexis when the FBI and NYPD are slowed down by bureaucracy. Taking matters into his own hands, he decides to go after Alexis himself. As he ventures into the criminal underworld alone, Beckett realizes that Alexis was the target of the kidnapping to begin with, but is too late to stop Castle from blindly wandering into an ambush. He is saved by a mysterious stranger, a spy calling himself Jackson Hunt (James Brolin), and who reveals himself to be Castle's father. Alexis' kidnapping has been orchestrated by a Russian named Volkov to force Hunt into showing himself so that Volkov can kill him in revenge for the death of Volkov's wife. Having tracked Alexis to Paris but knowing that he could not stop Volkov alone, Hunt brings Castle in and together they confront Volkov to barter for Alexis' life.
98	17	"Scared to Death"	Ron Underwood	Shalisha Francis	March 18, 2013 (2013-03-18)	517	11.26
The malevolent spirit of a serial killer has returned from the grave to wreak unholy vengeance on the people who saw him convicted — or at least that is Castle's belief when he unintentionally watches a "haunted" film connected to the case of a woman who was frightened to death.
99	18	"The Wild Rover"	Rob Hardy	Terence Paul Winter	March 25, 2013 (2013-03-25)	518	10.57
Ryan revives an old undercover alias when evidence in the murder of a baker leads the 12th Precinct back to the Irish mob, only to find that tensions within the mob are about to reach boiling point, culminating in a hostile takeover.
100	19	"The Lives of Others"	Larry Shaw	Terri Miller & Andrew W. Marlowe	April 1, 2013 (2013-04-01)	519	11.79
When an injury leaves him house-bound and bored, Castle becomes convinced that he has witnessed a murder — but with no body, no evidence and no other witnesses, Beckett begins to wonder if his writer's imagination is getting the better of him. While Castle enlists Alexis to help in his off-the-books investigation, Beckett is left to take the case of a murdered IRS agent on her own. Castle's murder case is ultimately revealed to be an elaborate surprise birthday present staged by Beckett, which inspires her to take a closer look at the evidence in her own case.
101	20	"The Fast and the Furriest"	Jonathan Frakes	Christine Roum	April 15, 2013 (2013-04-15)	520	10.18
Evidence at a crime scene suggests that a murderous Bigfoot is stalking the streets of New York City. While Castle indulges in his knowledge of cryptozoology, Beckett, Ryan and Esposito decide to follow much more mundane (but much more realistic) theories, only to hit a wall that makes them wonder if Castle's bizarre theories might actually be right this time.
102	21	"The Squab and the Quail"	Paul Holohan	Story by: Jason Wilborn & Adam Frost Teleplay by: Jason Wilborn	April 22, 2013 (2013-04-22)	521	11.76
When Beckett takes on a protective detail assignment to investigate an attempt on the life of self-made billionaire Eric Vaughn (guest star Ioan Gruffudd), Castle feels threatened by the man's charm and decides to win Beckett's heart back by solving the case by himself.
103	22	"Still"	Bill Roe	Rob Hanning	April 29, 2013 (2013-04-29)	524	10.53
A routine investigation escalates into a life-or-death situation when Beckett accidentally trips the sensor on a bomb, leaving her unable to move lest it detonate. While Ryan and Esposito search for the bomber to disarm it, Castle stays behind to reassure Beckett the only way he knows how — by testing her patience.
104	23	"The Human Factor"	Bill Roe	David Amann	May 6, 2013 (2013-05-06)	522	10.84
Mystery surrounds the death of a whistleblower who was killed in a precision military strike. As Beckett tries to stave off interference from the Department of Homeland Security, she attracts the attention of a special investigator for the Attorney General, who offers her a job in Washington, D.C. where she will work on the most challenging and sensitive cases in the country.
105	24	"Watershed"	John Terlesky	Andrew W. Marlowe	May 13, 2013 (2013-05-13)	523	11.16
The team open an investigation into the death of a young woman posing as a prostitute, and soon find themselves facing off against a powerful political dynasty with enough money to escape a murder conviction. Meanwhile, Beckett prepares to leave New York and join the Attorney General's office, but is forced to decide what she really wants in life when Castle proposes to her.

Season 6 (2013–14)

No. by series	No. by season	Title	Directed by	Written by	Original U.S. air date	Production number	U.S. viewers (in millions)
106	1	"Valkyrie"	John Terlesky	Rob Hanning	September 23, 2013 (2013-09-23)	601	11.46
(Part 1) Beckett accepts Castle's marriage proposal, before moving to to Washington DC for her new job, where she begins training and meets her new partner, xccMcCord (Lisa Edelstein). After 6 weeks apart, Castle surprises her at her apartment, where he causes some trouble when he attempts to help her with a classified case. Castle returns home to discover that Alexis has brought a new boyfriend, Pi, back from her trip to stay with her, but is soon taken into Federal custody, where Beckett tells him he was exposed to a deadly chemical agent and has only one day to live.
107	2	"Dreamworld"	Tom Wright	David Grae	September 30, 2013 (2013-09-30)	602	10.88
(Part 2) With Castle having less than 24 hours before he succumbs to the effects of a deadly toxin, Beckett and McCord race against time to track down both the toxin and the antidote to save him and prevent more people from being killed. Their search takes them deep into a mystery involving a highly-classified military base, a secret mission, and a coverup that reaches the very top of the Department of Defense.
108	3	"Need to Know"	Larry Shaw	Elizabeth Beall	October 7, 2013 (2013-10-07)	603	10.51
With Beckett still in D.C., Castle insinuates himself into Ryan and Esposito's latest investigation, the murder of former child star Charlie Reynolds. The case is soon taken over by Beckett and McCord when evidence ties Charlie to the Russian mafia, and Beckett is confronted with an ethical dilemma that ultimately costs her her job with the Attorney General.
109	4	"Number One Fan"	John Terlesky	Terence Paul Winter	October 14, 2013 (2013-10-14)	604	11.11
Castle is called in to negotiate a hostage crisis involving a murder suspect who will only speak to him, and puts his life in danger when he exchanges himself for two of the hostages. Gates allows Beckett, fired from her federal job, to assist with the investigation, even though budget cuts have prevented her reinstatement to the precinct. With the case resolved, Beckett is returned to active duty.
110	5	"Time Will Tell"	Rob Bowman	Terri Miller & Andrew W. Marlowe	October 21, 2013 (2013-10-21)	605	10.59
The initial suspect in a grisly murder, Simon Doyle (Joshua Gomez), claims to be a time traveler from the future who has come back to prevent a disaster. Castle is intrigued while Beckett is dismissive, but their investigation eventually leads them to the true killer, and events begin to play out eerily similar to Simon's stories.
111	6	"Get a Clue"	Holly Dale	Christine Roum	October 28, 2013 (2013-10-28)	606	10.69
Castle and Beckett are called to investigate a murder where the victim was left in a crucified position, and discover her death was related to the search of a Freemason treasure. Meanwhile, Castle's relationship with Alexis breaks down when he insults Pi in public.
112	7	"Like Father, Like Daughter"	Paul Holohan	Marc Dube	November 4, 2013 (2013-11-04)	607	10.87
Alexis and a professor are investigating the case of a man on death row in Pennsylvania, and when his exoneration is denied, with only three days until the sentence is carried out, she enlists Castle's help, even though she is still angry at him. When they begin to dig into the case, they encounter resistance from the townspeople, but with help from Beckett and the team, they uncover details that the local police overlooked, and find that the situation is much more complicated than it looked.
113	8	"A Murder is Forever"	Bill Roe	Chad Gomez Creasey & Dara Resnik Creasey	November 11, 2013 (2013-11-11)	608	10.05
Castle and Beckett investigate the murder of a popular couples' and relationship therapist. At first they believe the killer might have wanted her high-profile client list. Though, after further investigation it seems that he was after a rare, and pricey object that was in her possession.
114	9	"Disciple"	Rob Bowman	David Amann	November 18, 2013 (2013-11-18)	609	10.93
A murder victim bears an exact resemblance to Lanie. Investigation soon leads to another victim who resembles Esposito. The only connection between the two victims is plastic surgeon Dr. Kelly Neiman (Annie Wersching), who apparently has no motive. Castle believes this has something to do with Jerry Tyson—better known as the Triple Killer—whom everyone but himself believes to be dead. The team discovers too late that the Lanie and Esposito doubles were used to destroy all evidence of Tyson's crimes before they were murdered by his acolytes. Neiman escapes before she can be apprehended, leaving behind a flash drive intended for Castle and Beckett. Its seemingly innocuous contents leave Beckett deeply disturbed.
115	10	"The Good, the Bad and the Baby"	John Terlesky	Terri Miller	November 25, 2013 (2013-11-25)	610	11.41
A man stumbles into a church carrying a baby boy before dying from gunshot wounds. When Beckett's team investigates, they discover that the victim was involved in a hostage situation and rigging the lottery.
116	11	"Under Fire"	Paul Holahan	Andrew W. Marlowe & David Amann	January 6, 2014 (2014-01-06)	611	8.83
The team searches for a murderous arsonist when it is learned that the victim of a building fire was shot to death. Meanwhile, Ryan's wife Jenny (Juliana Dever) goes into labor, as he and Esposito become trapped in the latest fire.
117	12	"Deep Cover"	Tom Wright	Terence Paul Winter	January 13, 2014 (2014-01-13)	612	9.03
Jackson Hunt (James Brolin) returns to New York City with a mission to locate an Iranian intelligence officer. Disavowed by the CIA, he becomes the prime suspect in the murder of a computer hacker, with the investigation being led by Beckett.
118	13	"Limelight"	Bill Roe	Rob Hanning	January 20, 2014 (2014-01-20)	613	8.96
The 12th Precinct takes the case of Mandy Sutton (Alexandra Chando), a teenage pop star whose rise to fame brought with it media attention. Meanwhile, Beckett experiences the perils of being engaged to Castle first-hand when tabloid reports emerge of Castle reuniting with his ex wife.
119	14	"Dressed to Kill"	Jeannot Szwarc	Elizabeth Beall	February 3, 2014 (2014-02-03)	614	10.02
Castle and Beckett investigate a murder in the competitive world of high-end fashion, after magazine editor Matilda King's (Frances Fisher) assistant is found dead.
120	15	"Smells Like Teen Spirit"	Kevin Hooks	Chad Gomez Creasey & Dara Resnik Creasey	February 17, 2014 (2014-02-17)	615	7.75
Castle and Beckett are called in when two teenage girls witness a friend being killed by telekinesis during a video call.
121	16	"Room 147"	Bill Roe	Adam Frost	February 24, 2014 (2014-02-24)	616	8.69
What starts out as a straightforward murder case takes a turn towards the perplexing when three people all confess to the crime - and while all three know details of the murder that only the killer could know, each exonerates the others. Meanwhile, Alexis struggles with her guilt and her newfound independence after her relationship with Pi breaks down.
122	17	"In the Belly of the Beast"	Rob Bowman	Andrew W. Marlowe & David Amann	March 3, 2014 (2014-03-03)	617	8.38
Beckett is recruited for a dangerous undercover operation with the aim of stopping a near-mythical drug baron. With no support, no intelligence and no assistance from Castle, she must unravel a conspiracy that leads back to Senator William Bracken and his bid to become President.
123	18	"The Way of the Ninja"	Larry Shaw	Story by: Christine Roum & Shawn Waugh Teleplay by: Christine Roum	March 17, 2014 (2014-03-17)	618	9.99
A Japanese woman named Jade is killed while looking for those responsible for her parents' deaths when she was young. Castle finds the murder weapon, but it is taken out of his hand by a ninja. The investigation leads them to a Mr. Saito, who is affiliated with the yakuza. He is killed and Castle and Beckett would also have been killed, but they are saved by Jade's sister, Saya, the ninja. The killer was an American contractor for the yakuza.
124	19	"The Greater Good"	Holly Dale	David Grae	March 24, 2014 (2014-03-24)	619	9.78
A 9-1-1 call leads the team to a Wall Street broker's body. The caller works for the U.S. Attorney's office, alongside Gates' sister Elizabeth (Salli Richardson). The victim was their insider, investigating his boss. He made a $25 million wire transfer, given to him by his boss, and planned to take the money home to Venezuela. However, Elizabeth's partner believed the brokerage still needed investigating and killed him for "the greater good".
125	20	"That '70s Show"	John Terlesky	David Amann	April 21, 2014 (2014-04-21)	620	9.76
Construction workers unearth the remains of 1970s crime boss Vince Bianchi. His consigliere, Harold Leon (Jon Polito), is now senile and thinks it is still 1978. The detectives, with Martha's assistance, must re-create the era in costume and attitude so that Harold will fully cooperate in the cold case. Harold reveals he and Vince shared a secret that factored into his boss's death.
126	21	"Law & Boarder"	Tom Wright	Jim Adler	April 28, 2014 (2014-04-28)	621	N/A
127	22	"Veritas"	Rob Bowman	Rob Hanning & Terence Paul Winter	May 5, 2014 (2014-05-05)	622	N/A
128	23	"For Better or Worse"	John Terlesky	Terri Miller & Andrew W. Marlowe	May 12, 2014 (2014-05-12)	623	N/A

References

General references

• "Castle Episode Guide". TV Guide. Retrieved September 29, 2010.
• "Shows A-Z – castle on abc". The Futon Critic. Retrieved September 29, 2010.
• "Castle – Episode Guide". ABC. Retrieved September 29, 2010.

External links

• Castle at IMDb