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The 39 Clues: Unstoppable Series
Authors: Jude Watson, Jeff Hirsch, Natalie Standiford, Gordon Korman
Number of Books in Series: 4
Age Group: 8 - 12 years

Reading Level: AR Levels 4.4-5.8
GLE 3.4-5.0
DRA 50
Lexile® measure 610L-790L
Companion/Related Series: list of all 39 Clues series

This series continues the story that began in 39 Clues and then 39 Clues: Cahills vs. Vespers. It is best to read those series first before reading this one.

Book 1 Summary: 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.

39 Clues: Unstoppable Book List:

This series should be read in the correct order listed here.

Book 1: Nowhere to Run
Ages 8-12. September 24, 2013.
AR: 4.4 (8.0 Points, Quiz #162103);  GLE: 3.4
F&P/GRL: V;  DRA: 50
Lexile measure: 610L

Book 2: Breakaway
Ages 8-12. January 28, 2014.
AR: 4.9 (6.0 Points, Quiz #164353);  GLE: 4.4
F&P/GRL: U;  DRA: 50
Lexile measure: 720

Book 3: Countdown
Ages 8-12. April 29, 2014.
AR: 5.0 (6.0 Points, Quiz #166389);  GLE: 5
F&P/GRL: U;  DRA: 50
Lexile measure: 710L

Book 4: Flashpoint
Ages 8-12. August 26, 2014.
AR: 5.8 (8.0 Points, Quiz #169247);  GLE: 5
F&P/GRL: V;  DRA: 50
Lexile measure: 790L

Book Sets: Sets of Up to 4 Books

Best Seller Lists:

New York Times best-seller list
Publishers Weekly best-seller list
USA Today best-seller list
Wall Street Journal best-seller list

Other Websites for Additional Information:

Official or Publisher Website for The 39 Clues: Unstoppable Series
Author Website for Jeff Hirsch
Author Website for Natalie Standiford
Author Website for Gordon Korman


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Page Last Updated: November 29, 2020

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