This article has multiple issues. Please 39 clues unstoppable book 1 pdf improve it or discuss these issues on the talk page. This article describes a work or element of fiction in a primarily in-universe style. Please help rewrite it to explain the fiction more clearly and provide non-fictional perspective.
This article may contain an excessive amount of intricate detail that may only interest a specific audience. Please help by spinning off or relocating any relevant information, and removing excessive detail that may be against Wikipedia’s inclusion policy. 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 recently released, Superspecial.
They chronicle the adventures of two siblings, Amy and Dan Cahill, who discover that their family, the Cahills, has been the most influential family in history. The first story arc concerns Dan and Amy’s quest to find the 39 Clues, which are ingredients to a serum that can create the most powerful person on Earth. 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.