In a desperate move to protect his family, Michael officially retires and names , on the condition that Vincent ends his romantic relationship with Michael’s daughter, Mary.
Set in 1979, twenty years after the events of the second film, Michael Corleone is now in his 60s. Consumed by guilt—particularly over the murder of his brother, Fredo—Michael has moved the family away from its criminal roots. He has established the Vito Corleone Foundation, a massive charitable organization, and is seeking to buy a controlling stake in , a massive international real estate conglomerate connected to the Vatican.
Michael’s health begins to fail; he suffers from severe diabetes and a mounting sense of isolation. His ex-wife, Kay, remains distant, and his son, Anthony, refuses to join the family business, choosing instead to become an opera singer. The Tragic Conclusion in Sicily
While Michael seeks peace, a new generation of violence emerges. Vincent Mancini, the illegitimate son of Michael's late brother Sonny, enters the fold. Vincent is hot-headed and violent, much like his father. He is embroiled in a feud with Joey Zasa, a rival mobster who now runs the old Corleone territories in New York.