A blast rips through downtown Boston on an early October morning and Detective Michael Kelly races to the scene. But before he can begin to make sense of the attack, another explosion sends shockwaves through the city. Reeling, and desperate for answers, Kelly and his team begin a citywide manhunt. The only clue from the blast site leads Kelly to an inmate -- who is less than eager to help. As Kelly hones in on the forensics, his source reveals the killer's next targets. Armed with this knowledge, Kelly and his team rush to get out ahead of the mysterious murderer. But with the city at stake and the clock literally ticking, one wrong move could have catastrophic consequences. Can Kelly catch the bomber before time runs out?
