"Gluttony", "greed", "sloth", "envy", "pride", "lust" and "anger" are the seven deadly sins of human nature referred to in Catholic doctrine. The victims of the series of murders that occurred in the city happened to be people who had committed these doctrines. The murderer's mysterious methods of committing crimes made the senior and calm police officer Somerset (Morgan Freeman) and the hot-blooded rookie police officer Mills (Brad Pitt) fall into the mystery of solving the case. They went to the library to study Dante's "Divine Comedy", trying to find clues from the description of hell on earth, and finally found clues to the murderer's plan and means of committing the crime from the world of religious literature and philosophy. The murderer came to surrender himself, which made everyone relieved. They thought the case was over, but they still couldn't escape the murder logic of the seven deadly sins. This time the murderer's target was the person who committed the crime of "anger"...