The 39 Clues

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 Cahill and Dan Cahill, who discover that they are a part of the most influential and powerful family in history. The first arc follows Amy and Dan's quest to find the 39 clues, a secret that will make its discoverer the most powerful person in the world. Subsequent arcs chronicle Amy and Dan's conflicts with enemy parties who desire either the clues or other Cahill family secrets. This series' primary audience is ages 9–14. Since the release of the first novel, The Maze of Bones, on September 9, 2008, the books have gained popularity, positive reception, and commercial success. As of July 2010, the book series has about 8.5 million copies in print and has been translated into 24 languages. The books are published by Scholastic Press in the United States. Steven Spielberg acquired film rights to the series in June 2008, and a film based on the books was set to be released in 2016, but, as of October 2025, production has not yet started. The series also originated tie-in merchandise, including collectible cards and an interactive internet game.