To take down South Boston's Irish Mafia, the police send in one of their own to infiltrate the underworld, not realizing the syndicate has done likewise. While an undercover cop curries favor with the mob kingpin, a career criminal rises through the police ranks. But both sides soon discover there's a mole among them.
After his older brother passes away, Lee Chandler is forced to return home to care for his 16-year-old nephew. There he is compelled to deal with a tragic past that separated him from his family and the community where he was born and raised.