When an explosion jolts Boston, bomb squad expert Jimmy Dove (Bridges) is thrust into the most harrowing work of his career. Evidence points to a bomber more dangerous and skilled than any he's ever faced - except one. The possibility that the terrorist is his former mentor (Jones) increases the stakes - and as his friends and family are unsuspectingly drawn into the action, Jimmy is forced to face not only his bitter enemy...but also his haunting past.