Police officer Lancelin (Dennis Quaid) is also a single father. Due to his busy work, he has no time to take care of his two sons. His eldest son Alex often plays the role of a father. Lancelin has recently been entangled in a series of murders. At least four suspects have been found at each crime scene, and they all left a bloody message saying "Come and see". The state of the deceased being hung is full of religious meaning. Lancelin started from the iron frame where the human body was hung and found that this group of criminals used killing as a religious ritual and regarded themselves as the "Four Horsemen of the Apocalypse" recorded in the Book of Revelation. Christine (Zhang Ziyi), the Chinese adopted daughter of the first victim, took the initiative to find Lancelin and confessed her relationship with the serial murders, but this could not prevent more people from being victimized. Lancelin was shocked to see that the thing he least wanted to see happened...