The Viper's Nest
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|The Viper's Nest|
The Viper's Nest
|Country|| United States
|Series||The 39 Clues|
|Publication date||February 2, 2010|
|Media type||Print (hardcover)|
|Preceded by||In Too Deep|
|Followed by||The Emperor's Code|
The Viper's Nest is the seventh book in The 39 Clues series. It was written by Peter Lerangis and was released by Scholastic on February 2, 2010. The 39 Clues series is intended for children aged 8–12, and takes the form of a multimedia adventure story spanning 10 books. The stories focus on a brother and sister, Amy and Dan Cahill, and their efforts to piece together clues left by the matriarch of the family, Grace Cahill, upon her death.
The Viper's Nest follows immediately on from the events of the preceding book: In Too Deep. The events are described, below, using in-universe tone. Shocked by the death of Irina Spasky, Dan and Amy venture into danger once again. For the first, they begin to question how much they trust their au pair, Nellie. Later in the book, she regains their trust.
The morse code dashes and dots, along the page margins in the middle of the book, reads: "There is a madrigal watcher".
Plot summary 
Amy and Dan Cahill are staying inside a small cabin with their uncle, Alistair Oh. However, the evil Isabel Kabra starts a fire in the cabin. Surprisingly, former secret agent and murderer, Irina Spasky, brings them a pole to slide down to safety. Irina climbs to the top and helps them down, but the pole catches fire. Irina senses that the roof will collapse, reflects on her life and decides that she has lived long enough. The roof collapses under her, and she dies.
The book begins the morning after the fire that killed Irina Spasky, who was an ex-KGB and Lucian spy. The two were shaken by what had happened, not believing that Irina was on their side, after attempting to kill them earlier in the series. Using their de-coding abilities, Dan and Amy figure that the last words Irina spoke were actually a song: "I'm with you and you're with me and so we are all together", which points them to Pretoria, South Africa.
Here, they are given a postcard suggesting a connection with Shaka. As they unravel the history of Shaka, they find out that he was a member of the Tomas branch, and was connected to Winston Churchill. They find the clue, aloe, but are captured by the Kabras while leaving South Africa. Isabel Kabra offers Dan and Amy to join their family. When they decline, Isabel orders them to be tied in chairs, and chopped to pieces by a spinning propeller.
They escape with the help of Professor Bardsley, together with the vial of green liquid that they thought was their lead to the second clue in The Maze of Bones, by flying Grace Cahill's old plane, The Flying Lemur. During the ride, Dan and Amy accidentally break the vial, spilling some of the contents onto Dan's arm. It turns out to be a Lucian poison. To get the antidote, they fly to Grace Cahill's home in Madagascar.
While at Grace's Madagascar home, they find a page in her journal that says, ″I am feeling melancholy today, thinking about my dear A & H and missing them so. I cannot even bear to listen to my beloved di Lasso, because of the reminder...″, and on another page it says, ″I have written Deng Xiaoping, who has agreed to grant to visit to A & H when he discovered that they, like him, are "M."
This, along with a piece of music by di Lasso, leads Dan to realize that his and Amy's family branch is the Madrigals.
Page code 
In the pages 39–65 above the side decorations is some Morse code. On The 39 Clues website, there is a morse code translater which you can translate it to. The morse code translates to, 'There is a Madrigal watcher'.
The letters on the spears on the inside cover and back of the book are an anagram. If you flip from the front to the back over and over, taking the 1st letter in the front, 1st letter in the back, 2nd letter in the front, and so on. It says "Madrigal leader = Grace".
- The Viper's Nest at the 39 Clues wiki.
In Too Deep by Jude Watson
|The 39 Clues Series
The Emperor's Code by Gordon Korman