The film mainly tells the struggle of the second-generation godfather Mike Corleone (Al Pacino), and also recalls the hardships of the first-generation godfather Vito Corleone (Robert De Niro) in starting a business, reflecting different historical periods., the careers and family lives of the two generations of godfathers. The night Mike held the Holy Communion ceremony and celebrations for his son Tony, Mike was attacked at his home. The murderer was silenced and faced with numerous crises since he took over the family business. Mike recalled his father Vito Corleone's entrepreneurial journey in the United States when he was young. While investigating the truth of the attack, Mike continued to carry out gambling, hotels and other businesses, competing with another gangster, Haimen Ross, and continued to expand his power. Finally, Mike's illegal behavior attracted the attention of the government, and Mike was subjected to a series of accusations; at the same time, Mike's family also encountered a crisis, and the couple's relationship was on the verge of breaking down; what saddened Mike the most was the betrayal of his relatives in the family. Compared with the happy family life of the first generation of godfathers, Mike is undoubtedly a failure. How does Mike face the dual crises of his career and family? Why do two generations of godfathers have very different family lives? Let us find the answer ourselves in the film.