Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Nowhere to Run | 2013 | Jeff Hirsch | Buy |
| 2 | Breakaway | 2013 | Jeff Hirsch | Buy |
| 3 | Countdown | 2014 | Jeff Hirsch | Buy |
| 4 | Flashpoint | 2014 | Jeff Hirsch | Buy |
The 39 Clues: Unstoppable is a four-book fiction series by Jeff Hirsch, published across 2013 and 2014. It is part of the larger 39 Clues franchise, and the story kicks off with Nowhere to Run before continuing through Breakaway, Countdown, and Flashpoint.
The books are fast-paced and designed to be read in sequence, with each entry picking up where the last one left off. Flashpoint (2014) brings the Unstoppable arc to a close. Readers new to The 39 Clues should start with the original series before jumping into this one.