A fact-based drama, written by Paul Attansio (taking as its source Joe Pistone's memoir, My Undercover Life in the Mafia), about FBI man Pistone (Johnny Depp), who infiltrates the Mafia under cover of an assumed identity as jeweller 'Donnie Brasco'. He is then taken under the wing of loyal and likeable foot soldier Lefty Ruggiero (Al Pacino).