Reacher and Neagley investigate the murder of a member of 110th, a group of Special investigators assembled by Reacher, only to realize the whole unit may be at risk.

The investigation into Franz's murder takes Reacher and the surviving members of his former Army unit to Atlantic City where the mystery deepens, danger awaits, and an old flame is rekindled.

After more of his friends fall victim, Reacher forges an uneasy alliance with a dogged detective, and their only clue in the case leads the 110th to a troubling discovery.

Reacher and his team head to Boston to track down a political aide with insider knowledge of a top secret military-defense contract that may be the reason behind their friends' deaths.

Neagley and Dixon discover shocking information about an old friend in Denver while Reacher and O'Donnell learn more about the nefarious and mysterious A.M..

As the team close in on Langston, two members of the 110th face danger, compelling Reacher to devise a dangerous plan to rescue them.

Reacher and Neagley make a final desperate attempt to save O’Donnell and Dixon, stop A.M. and avenge their friends’ murder.