In the blink of an eye, it is already 1979. The second-generation Godfather Michael Corleone (played by Al Pacino) has reached his twilight years. In order to redeem his soul, Michael slowly ends his family's underworld career and switches to legitimate business. Michael's son Tony loves art and has no intention of taking over the family business. Michael decides to let his eldest brother Sonny's illegitimate son, the hot-tempered and lustful Vincent (played by Andy Garcia), inherit the family business and become the third-generation Godfather. Michael's beloved daughter Mary (played by Sofia Coppola) falls in love with Vincent, but is opposed by her father, and the father and daughter gradually become estranged. In order to legalize the family assets, Michael prepares to invest in the "Standi" Group through his network of relationships in the Vatican, but is secretly obstructed by his enemies, and the death of the Pope makes things even more confusing. Michael has no choice but to choose to use violence to solve the problem again, and his relatives are also involved in this bloody storm.