A chance encounter with a distraught stranger on a Philadelphia subway car draws Jack Reacher into a deadly mystery involving a missing flash drive that contains secrets worth hugging for.

Tamara finds herself caught up in the mystery whether she likes it or not as she, Reacher, and Jacob face off against shady government agents and a mysterious squad of professional soldiers all looking for the same missing flash drive.

Reacher learns that things are more complex than they seem as he and Lila draw closer. Meanwhile, Tamara, Jacob, and Plum find an important clue after another attack from one of their mysterious adversaries sends them back to Philadelphia.

Reacher talks to Sampson, Tamara breaks into a government structure, Jacob gets bad news, and the team learns information that changes everything.

Following a misunderstanding, Reacher becomes the most wanted man in Philadelphia. Old enemies track it down and new ones appear. Jacob, Tamara and Plum end up involved in a shooting and Jacob avenges his sister's passing.

On the run from the police, Reacher and Tamara leave town in search of the mysterious Ahlquist, but they end up in trouble. Meanwhile, in Philadelphia, Jacob and Plum must face their own problems.

Reacher and Tamara finally get the answers they've been waiting for, while Jacob discovers that their woes have just begun when Plum's sources provide crucial information.

Reacher, Tamara and Jacob go on the attack as the real extent of the plot emerges. Reacher confronts those responsible for Anna's passing, Jacob is forced to face the truth, and Plum has a chance to redeem herself.