In the late 1970s, Boston's FBI aimed to break the Mafia's grip on the city's north. Agent John Connolly, a native of South Boston, formed an unlikely alliance with crime lord James "Whitey" Bulger, targeting the Mafia as his main foes.

Black Mass
In the midst of a turf war in South Boston, a ruthless criminal with powerful family ties decides to cooperate with the FBI to take down a rival Mafia family, driven by a fierce determination to safeguard his own territory.