Gideon suspects that a serial bomber attacking a small town is actually a disciple of Adrian Bale, his greatest nemesis.

The Behavioral Analysis Unit is on the trail of a serial bomber who turns out to be a copycat of Adrian Bale, the bomber responsible for murdering Gideon's previous team of profilers in Boston several years prior. Gideon must confront his old nemesis face to face in order to get important information that could help them catch Bale's protégé.