Based on true events, two of New York's most notorious organized crime bosses, Frank Costello (played by Robert De Nero) and Vito Genovese (also played by Robert De Nero), as they vie for control of the city's streets. Once the best of friends, petty jealousies and a series of betrayals place them on a deadly collision course that will reshape the Mafia (and America) forever.

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Yn seiliedig ar ddigwyddiadau go iawn, dau o benaethiaid troseddu cyfundrefnol mwyaf drwgenwog Efrog Newydd, Frank Costello (Robert De Nero) a Vito Genovese (Robert De Nero), wrth iddynt gystadlu am reolaeth ar strydoedd y ddinas. A hwythau'n ffrindau gorau gynt, mae cenfigen bitw a chyfres o fradychiadau yn eu harwain tuag at wrthdaro marwol a fydd yn gweddnewid y Maffia (ac America) am byth.