The Maze of Bones is the first novel of The 39 Clues series, written by Rick Riordan and published September 9, 2008 by Scholastic. It stars Amy and Dan Cahill, two orphans who discover, upon their grandmother Grace's death, that they are part of the powerful Cahill family, whose members constantly fight each other for Clues, which are ingredients to a mysterious serum. The novel has received generally positive reviews. A graphic novel adaptation by Ethan Young was published in 2023.
The 39 Clues is a series of adventure novels written by a collaboration of authors, including Rick Riordan, Gordon Korman, Peter Lerangis, Jude Watson, Patrick Carman, Linda Sue Park, Margaret Peterson Haddix, Roland Smith, David Baldacci, Jeff Hirsch, Natalie Standiford, C. Alexander London, Sarwat Chadda and Jenny Goebel. It consists of five series, The Clue Hunt, Cahills vs. Vespers, Unstoppable, Doublecross, and Superspecial. They chronicle the adventures of two siblings, Amy and Dan Cahill, who discover that their family has been, and still is, the most influential family in history.
One False Note is the second book in The 39 Clues series. It is written by Gordon Korman, and was published by Scholastic on December 2, 2008. Following the events of The Maze of Bones, the protagonists Amy and Dan Cahill learn about Mozart and travel to Vienna, Austria to search for the second clue in the 39 Clues competition. One False Note entered the Children's Books New York Times Best Seller list at number one on December 21, 2008 and stayed on the list for children's chapter books for 12 weeks.
The Sword Thief is the third book in The 39 Clues series. It was written by Peter Lerangis and was published by Scholastic on March 3, 2009. The Sword Thief follows the first two books in the series, The Maze of Bones by Rick Riordan and One False Note by Gordon Korman. The following book continues the plot in Beyond the Grave.
Beyond the Grave is the fourth book in The 39 Clues series first published on June 2, 2009 and written by Jude Watson. Thematically the novel uses Biblical knowledge, prophecy, and spiritual topics to explore the afterlife. Amy and Dan Cahill, the protagonists, travel to Egypt because of a clue they discovered in The Sword Thief. The symbols in the middle of the book translate "Alistair was there the night they died."
The Black Circle is the fifth book in The 39 Clues series and is written by Patrick Carman. This book was released on August 11, 2009. The Black Circle was selected as Al Roker's book club pick.
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 Emperor's Code is the eighth book in The 39 Clues series written by Gordon Korman. The book's cover, revealed on March 2, 2010, shows a red mask with codes imprinted in specific areas against a purple background. After the release, readers were asked to find three of the four codes printed on the mask. If successful, 39 Clues fans could read an excerpt from The Emperor's Code.
Storm Warning is the ninth book in The 39 Clues series. It is written by Linda Sue Park and was released on May 25, 2010. The geographical coordinates that appear on the ship on the book's cover indicate a point about six kilometers southeast of Albert Town, Jamaica.
Into the Gauntlet is the tenth book in The 39 Clues novel series. It was written by Margaret Peterson Haddix and released on August 31, 2010.
Rapture of the Deep: Being an Account of the Further Adventures of Jacky Faber, Soldier, Sailor, Mermaid, Spy is a historical novel by L.A. Meyer, published in 2009. It is the seventh book in the Bloody Jack book series about a teenage girl named Jacky Faber, alias Bloody Jack, set in the early 19th century. In this installment, Jacky returns from her 'history-defining' adventure as a Parisian nightclub spy and messenger for Napoleon Bonaparte.
Vespers Rising is a part of The 39 Clues franchise, which includes the 39 Clues books, card packs, and interactive online games. The book is a transition between the first series, The 39 Clues, and the second, Cahills vs. Vespers. It was written by Rick Riordan, Peter Lerangis, Gordon Korman, and Jude Watson. The book was released on April 5, 2011. Unlike the other 10 books, the title card shows a series of dots rather than a globe.
The Medusa Plot is the first book in the Cahills vs. Vespers series. The book was written by Gordon Korman and released on August 30, 2011. The story picks up two years after the original series The 39 Clues and is about the Cahills' attempt to save members of their family that have been kidnapped by following the instructions given by Vesper One.
A King's Ransom is the second book in the Cahills vs. Vesper's series. The book was written by Jude Watson and published on December 6, 2011. The story picks up right after the previous book and continues to follow Dan and Amy as they try to get back the kidnapped members of their family as they go on a journey to remember.
Three Times Lucky is a 2013 New York Times Best Seller adolescent novel by author Sheila Turnage. Three Times Lucky was a Newbery Medal Honor Book in 2013.
The 39 Clues: Doublecross is the fourth series in the 39 Clues series of books. The series was published from 2015 to 2016. It follows the story of the Cahills as they suffer from infighting. In the first book, Mission Titanic, Ian Kabra has become the new leader of the Cahills. Dan and Amy decided to take a break from the Cahills after nearly dying from combating Pierce and his thugs. Although Ian believe that he is much more fit to rule the Cahills that Amy and Dan, it seems that the Cahills do not fully recognize Ian as the leader. Ian has suspicions that many Cahills are plotting a coup. When this coup is realized, Ian Kabra and Cara Pierce are expelled from the Cahill home in Attleboro, Massachusetts. The leader of the coup is the Outcast, and he plans to replicate history's worst disasters in order to test Cahill leadership. The Cahills are expected to prevent the disasters in order to prove that they are worthy. Throughout the series, the Cahills make many shocking discoveries, discovering that Grace was actually ruthless and cruel, and that the Outcast is Nathaniel Hartford, the husband of Grace whom Grace wanted dead. There are four books in the series:
Countdown is the third book in the Unstoppable series of The 39 Clues franchise. It was written by Natalie Standiford, and published on April 29, 2014. The cover features a broken Mayan artifact, as the book primarily takes place in Tikal, Guatemala.
Flashpoint is the fourth and final book in the Unstoppable series. It was written by Gordon Korman, and published on August 26, 2014.
United States 
United Kingdom 
Canada 
