After his successful plot to take revenge on all the people who wronged him, Dave is now a hero cop. But a call to Ireland starts a whole new cycle of revenge in which Detective Davenport and Detective Gearhart are now the prime targets.
Detective Maria Sciacca joins the 113th precinct as Sean's new partner, but still obsessed with his former partner's murder, Sean drags Maria into the secret circle.
Things come to a boiling point when Sal gets caught in the middle of Sean's war with FBI agents Tim and Tyler who soon take their partnership to a whole new level.