YEUNG CHUNG (Pu Siu Wai) is a talented policeman being highly appreciated by other senior officers. He is especially good at investigating cases of maniac killers as he studies psychology and criminology.

One day he begs a female colleague to hook the killer. He catches the criminal successfully but he has to resigned. The only one who is happy to see this is his girlfriend JACKIE. They decide to go overseas to live.

Meanwhile a murderer turns up, killing a family with a cutter. KU begs CHUNG to assist him in catching the killer.

CHUNG indulges in his work again, risking his life. JACKIE is discontented and warns him. However he does not take his words. She leaves him at last.

CHUNG becomes hot-tempered and tells everything to the priest MA who brings him up and he is ill. Suddenly he is arrested as JACKIE has been killed and he is suspected.… ...