Amanda McCready is a 4-year-old who has disappeared from her Boston home. The police make little headway in solving the case, so the girl's aunt hires Patrick Kenzie and Angie Gennaro, private detectives. They freely admit that they have little experience with this type of case, but the family wants them for two reasons: they're not cops and they know the tough neighborhood in which they all live. As the case progresses, Patrick and Angie must face...

In South Boston, the state police force 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 Unit....