The front cover of the first US hardcover edition of Mostly Harmless.
|Cover artist||Peter Cross, US hardcover|
|Country||United Kingdom, United States|
|Series||The Hitchhiker's Guide to the Galaxy|
|Publisher||William Heinemann, UK; Harmony Books, US|
|Media type||Paperback, hardcover|
|Pages||229, UK paperback; 240, US paperback|
|Preceded by||So Long, and Thanks for All the Fish|
|Followed by||And Another Thing...|
Mostly Harmless is a novel by Douglas Adams and the fifth book in the Hitchhiker's Guide to the Galaxy series. It is described on the cover of the first editions as "The fifth book in the increasingly inaccurately named Hitchhikers Trilogy". It was the last Hitchhiker's book written by Adams.
The title derives from a joke early in the series, when Arthur Dent discovers that the entry for Earth in The Hitchhiker's Guide to the Galaxy consists, in its entirety, of the word "Harmless". His friend Ford Prefect, a contributor to the Guide, assures him that the next edition will contain the article on Earth that Ford has spent the last 15 years researching—somewhat cut due to space restrictions, but still an improvement. The revised article, he eventually admits, will simply read "Mostly harmless". It later turns out that Ford had written a long essay on how to have fun on Earth, but the editors in the guide's main office building edited everything out. Later in the series, Ford is surprised to discover that all of his contribution had been edited back into the Guide, prompting his reunion with Arthur on the alternative Earth in So Long, and Thanks for All the Fish.
Arthur Dent plans to sightsee across the Galaxy with his girlfriend Fenchurch, but she disappears during a hyperspace jump, a result of being from an unstable sector of the Galaxy. Depressed, Arthur continues to travel the galaxy using his biological donations to DNA banks to fund his travels, and knowing that he cannot die until he visits Stavromula Beta, as told to him by the insane Agrajag who had been repeatedly killed in various ways by Arthur before being reincarnated. During one trip, he ends up stranded on the homely planet Lamuella, and decides to stay to become a sandwich maker for the local population.
Meanwhile, Ford Prefect has returned to the offices of the Hitchhikers' Guide, and is annoyed to find out the original publishing company, Megadodo Publications, has been taken over by InfiniDim Enterprises, which are run by the Vogons. Fearing for his life, he escapes the building, along the way stealing the yet-unpublished, seemingly sentient Hitchhiker's Guide Mk. II. He goes into hiding after sending the Guide to himself, care of Arthur, for safekeeping.
On Lamuella, Arthur is surprised by the appearance of Trillian with a teenage daughter, Random Dent. Trillian explains that she wanted a child, and could use the only human DNA she could find, thus claiming that Arthur is Random's father. She leaves Random with Arthur to allow her to better pursue her career as an intergalactic reporter. Random is frustrated with Arthur and life on Lamuella; when Ford's package to Arthur arrives, she takes it and discovers the Guide. The Guide helps her to escape the planet on Ford's ship after Ford arrives on the planet looking for Arthur. Discovering Random, the Guide, and Ford's ship missing, the two manage to find a way to leave Lamuella and head for Earth, where they suspect Random is also heading to find Trillian. Ford expresses concern on the Guide's manipulation of events.
Reporter Tricia McMillan is an alternate version of Trillian living on Earth who never took Zaphod Beeblebrox's offer to travel in space. She is approached by an extraterrestrial species, the Grebulons, who have created a base of operations on the planet Rupert , a recently discovered tenth planet in the Solar System. However, due to damage to their ship in arriving, they have lost most of their computer core and their memories, with the only salvagable instructions being to observe something interesting with Earth. They ask Tricia's help to adapt astrology charts for Rupert in exchange for allowing her to interview them. Tricia conducts the interview, but the resulting footage looks faked. She is called away from editing the footage to report on a spaceship landing in the middle of London.
As Tricia arrives, Random is leaving the ship. Random yells at Tricia, believing Tricia to be her mother. Arthur, Ford, and Trillian arrive and help Tricia to calm Random. They remove her from the chaos surrounding the spacecraft and take her to a bar. Trillian tries to warn the group that the Grebulons, having become bored of their mission, are about to destroy the Earth. Random disrupts the discussion by producing a laser gun she took from her ship. Arthur, still believing he cannot die, tries to calm Random's nerves, but a distraction causes her to flinch. She fires the weapon, sending the bar into a panic. Arthur tends to a man hit by the blast, and learns he is another reincarnation of Agrajag. He also discovers that the bar is named "Stavro Mueller - Beta". Arthur begins to laugh as a larger panic builds outside.
The Grebulons, having determined that removing Earth from the astrological charts will improve their horoscopes, destroy it. It is revealed that the Vogons designed the Guide Mk. II with the ability to see the potential outcome of any event, enabling it to ensure that every version of the Earth in all realities is destroyed. With its mission complete, the Guide collapses into nothingness.
In the alternate ending, after the destruction of Earth, the description of the Babel fish from the earlier series is replayed with an additional section, which states that dolphins and Babel fish are acquainted, and that the dolphins' ability to travel through possibility space (first mentioned in The Hitchhiker's Guide to the Galaxy and elaborated on in So Long, and Thanks for All the Fish) is shared by the Babel fish as well. During the ending, Ford explains that the dolphins got taught this skill from the Babel fish in exchange for knowing a good place to have parties. All the major characters are carrying Babel fish in their ears, which rescue them at the moment of Earth's destruction by transporting them to the Restaurant at the End of the Universe. The characters are reunited with Marvin, and it is revealed that beyond the Restaurant (and beyond the car park in which Marvin works) lies an endless series of blue lagoons — the final destination of the dolphins. The series ends with Arthur asking Fenchurch, "Will you come flying with me?", and her reply, "Always."
The version released on CD contains an even longer set of alternate endings, including one set after the events of the twelfth radio episode (with Arthur Dent and Lintilla), and on an alternate Earth where Arthur Dent and Fenchurch engage in a stand-off against Mr Prosser, together.
There have been four unabridged audiobook recordings of the novel. In 1992, Adams himself recorded an edition, later re-released by New Millennium Audio in the United States and available from BBC Audiobooks in the United Kingdom. In 2006, actor Martin Freeman, who had played Arthur Dent in the 2005 movie, recorded a new edition of the audiobook. This is the only book in the five novel series not to have also had a prior, abridged edition read by Stephen Moore. In addition, the National Library Service for the Blind and Physically Handicapped released a version of the book, narrated by George Guidall-Shapiro, on 4-track cassette tape in 1993. They released the book again as part of a larger work called The Ultimate Hitchhiker's Guide to the Galaxy (with forward by Neil Gaiman, and including other books in the series), narrated by David Cutler; available on cassette as RC 62183, and in encrypted DAISY downloadable form as DB 62183. The NLS books can be found using their book search engine, by entering the book numbers or titles.
Academia and popular culture
Joshua D. Angrist and Joern-Steffen Pischke named their applied econometrics toolkit book "Mostly Harmless Econometrics" in the spirit of Douglas Adams' The Hitchhiker's Guide to the Galaxy and Mostly Harmless.
- "NLS Catalog Search (by book number, title, etc.)".
- Angrist, Joshua D., Pischke, Joern-Steffen (2009). Mostly Harmless Econometrics, An Empiricist's Companion. Princeton and Oxford: Princeton University Press.