The 39 Clues: Unstoppable Series is the third story arc in the bestselling young adult franchise The 39 Clues. It expands the story of Amy and Dan Cahill after the first two series The Clue Hunt and Cahills vs. Vespers. The series features 4 adventure books written by bestseller authors including Jude Watson and Gordon Korman.
Here it is, the fantastic end of the spectacular young adult series The 39 Clues: Unstoppable, Flashpoint. This fourth adventure book of the series is written by Gordon Korman and first published in 2014.
First released in 2014, Countdown is an adventurous young adult novel written by Natalie Standiford. It is the 3rd and penultimate book in The 39 Clues: Unstoppable series, the third story arc of The 39 Clues Franchise.
Breakaway is a brilliant adventure novel and the 2nd book in bestselling young adult series, The 39 Clues: Unstoppable. Originally published in 2014, the book is written by Jeff Hirsch.
First released in October 2013, Nowhere to Run is a thrilling young-adult novel written by Jude Watson. It is the first book in The 39 Clues: Unstoppable series, the 3rd story arc in The 39 Clues adventure franchise, sequel to Cahills vs. Vespers series.