Philadelphia, 1990s. Mobster "Little Nicky" Scarfo's arrest creates a power vacuum, sparking a bloody fight for control of the city's crime syndicate.

As the war escalates and the FBI races to collect evidence, Stanfa hires a hitman to take out his rivals — but the move turns out to be his undoing.

With Stanfa behind bars, a media-savvy Merlino takes control of the city. A risky undercover effort ensues to infiltrate his ranks and end the Philly mob.