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Tammy goes unconscious when she falls asleep. She wakes to find blood all over her body, but no wounds, and finds she's lost all memory of what happened. She seeks help from Sam's Detective Bureau. At the same time a mysterious man asks Sam to investigate some recent murders, seemingly caused by some sort of vicious animal. During his investigation Sam finds that the animal's DNA seems to indicate that it is a cheetah, and that Tammy's DNA is the same. When Sam rushes over to Tammy's house, he finds something that must be seen to be believed.

Once Tung refuses to pay for his debt, he calls Chi Lung to beat the man of brother Wai. Wai wants to union with Fai to fight with Tung but Fai does not want any gang business. Wai ambushes Tung in order to assassinate him and tries to claim that is Fai's order. Wai wants to start a war between them, so he can be the last winner. Tung falls into Wai's trap. Wai tries to lead Tung to his death trap.

Two Hong Kong police officers addict themselves in the department's mystery cases. They quit the team and set up a research institute to investigate the mystery cases.