Joseph Pistone (Johnny Depp) is an FBI agent who has infiltrated one of the major New York Mafia families and is living under the name Donnie Brasco. He develops a relationship with mob hit man Benjamin "Lefty" Ruggiero (Al Pacino) in order to get deeper under cover, but ends up developing a real friendship with the Mafioso. As their relationship develops, Pistone must decide whether or not to complete his job, knowing that it will lead to the...