Jesse Stone is shot while moonlighting on a Boston stakeout, leaving his friend fighting for his life and Stone out for justice. His rogue investigation to find the shooter leads him into Boston's shady underworld. This leads him right into the bed of a Boston PD investigator, who wants his head on a platter if he continues to pursue the case. Meanwhile, Stone is approached by a broken-hearted mother who is convnced her kidnapped son is still alive....

In South Boston, the Massachusetts State Police are waging a war on Irish-American organized crime. Undercover cop Billy Costigan is assigned to infiltrate the mob syndicate, which is run by gangland chief Frank Costello. Billy quickly gains Costello's confidence. Colin Sullivan is a hardened young criminal who has infiltrated the police department as an informer for the syndicate. Colin is rising to a position of power within the Special Investigation...