Sean Kane is forced to resign from the San Francisco Police Department's Narcotics Division when he goes berserk after his partner is murdered. He decides to fight alone and follows a trail of drug traffickers into unexpected high places.
In the continuing saga of the Corleone crime family, a young Vito Corleone grows up in Sicily and in 1910s New York. In the 1950s, Michael Corleone attempts to expand the family business into Las Vegas, Hollywood and Cuba.