|Publication Date:||October 1st, 2013-August 2014|
|Pages:||Varies by book|
|Preceded By:||Cahills vs. Vespers|
Unstoppable is the series that follows the Cahills vs. Vespers series. It is the third arc in The 39 Clues. It will have four books.
This book was written by Jude Watson. It was released October 1st, 2013.
The Cahill Family Has A Secret
For five hundred years, they have guarded the 39 Clues — thirty-nine ingredients in a serum that transforms whomever takes it into the most powerful person on earth. If the serum got into the wrong hands, the disaster would rock the world. So certain Cahills have always made it their mission to keep the serum safe, buried, locked away. Until now.
Thirteen-year-old Dan Cahill and his older sister, Amy, are the latest guardians of the Clues. They think they've done everything right, but a tiny mistake leads to catastrophe. The serum is missing and Dan and Amy have to get it back and stop who stole it . . . before it's game over. For everyone.
This book will be written by Jeff Hirsch. It will be released on January 28th, 2014.
A Nightmare Come True
As a member of the most powerful family history has ever known, thirteen-year-old Dan Cahill has been shot at, kidnapped, and even thrown into a pit with a deadly snake. He's survived it all due to luck, smarts, and his older sister, Amy, who always sticks by his side.
Now Dan and Amy are facing their greatest threat yet, an enemy who has found a way to use the source of the Cahill family power against them. To stop him, Dan and Amy must set out on a desperate mission that will take them from one of the world's hottest regions all the way to the frozen blast of the Arctic Circle. But with the enemy closing in , Dan finds himself facing the one terror he never imagined - being betrayed by his own sister
Book Three: Countdown
The series "finale" will be written by Gordon Korman. It will be released in August 2014.