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Dove receives a call from Gaerity and realizes that Kate and his stepdaughter Elizabeth are in danger.
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Later, at the site of a fake bomb threat, technicians Rita and Cortez are killed by an explosive hidden in their bomb disposal robot. Gaerity sets up bombs specifically designed to kill the rest of the bomb squad: the first victim, Blanket, is killed by a bomb placed under a bridge on the night of Dove's wedding to his fiancee Kate. He takes a job as a janitor at the police station to learn more about Dove's present life and his co-workers. Gaerity sees Dove on TV and makes his way to Boston, taking residence in an abandoned casino boat. Only Dove's uncle, retired Boston police officer Max O'Bannon, is aware of his past and encourages Dove to retire early, feeling he has done his penance. Devastated, McGivney moved to Boston and took on a new identity, hoping to find atonement in saving others by defusing bombs. He had been friends with Gaerity, but when Gaerity tried to set off a bomb that would have killed numerous civilians, he interceded, ending in the death of his girlfriend (Gaerity's sister), and leading to Gaerity's imprisonment. Dove hides that he is really Liam McGivney, a former member of a Northern Ireland terrorist cell. In Boston, Lieutenant James "Jimmy" Dove is a veteran member of the police force's bomb squad, on the verge of retirement and helping to train newer recruits. Irish Republican Army fighter Ryan Gaerity escapes from his cell in a castle prison in Northern Ireland after turning a toilet into a bomb, killing a guard and his cellmate in the process.
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