Joe Pistone continues his story of spending six years undercover as the gangster Donnie Brasco. With the help from the FBI and other undercover agents, Pistone spread his own influence and string operation beyond New York, to Wisconsin and Florida. 

As Brasco continued to make his way up the mafia hierarchy, he grew increasingly close to Sonny Black Napolitano, gaining his trust and friendship. But things came to a head when Napolitano proposed for Brasco to become a full-fledged mafioso – requiring that he do something that the FBI couldn't condone: murder.