A robbery case occurred in a certain jurisdiction. Due to the suspects being highly capable of covering their tracks, the leads in the hands of the detectives repeatedly led them to a dead end. However, the detectives remained undaunted, stayed true to their original intentions, and worked day and night to conduct thorough investigations, subsequently discovering new leads. Following these leads, the detectives apprehended two robbery suspects in succession, and during interrogation, both of them confessed to the robberies. However, the detectives did not close the case there. During the course of solving this case, they found that the ringleader was involved in a gambling case. According to their confession, they resorted to robbery because of owing a large gambling debt, and the gambling den was located on a tourist boat. Disguised as passengers, the detectives boarded the boat to participate in the gambling, and with a combination of inside and outside cooperation, they successfully raided and dismantled the illegal gambling operation....

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In the film, Zhang Xiaolong, Wang Tai and others are once teammates who have gone through adversity together and close as family. Later, Zhang Xiaolong and Wang Tai have a disagreement. Wang Tai is filled with hatred and wants to frame Zhang Xiaolong during a mission. Lian dies to save Zhang Xiaolong, and Zhang Xiaolong retires in despair. Wang Taili chooses to become a villain and frames Zhang Xiaolong. Zhang Xiaolong suffers the tragic death of his girlfriend, the betrayal of his brother, and is charged with murder and wanted by both the triad and the authorities. However, instead of becoming depressed, he faces it optimistically. He gathers like-minded partners to fight to the death against Wang Tai's triad....