A merciless assassin stalks Belfast and Detective Inspector Jack Lennon has been assigned to the case. As Lennon unravels a far-reaching conspiracy involving collusion among Loyalists, IRA members, and law enforcement, he discovers that his estranged former lover and their daughter are in the killer's cross-hairs. To catch the assassin and save the only family he has, Lennon blurs the line between friend and enemy by teaming up with an enigmatic killer named Fegan.