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Constable, KO CHUNG CHING, receives information that the serial killer, nickname “Rose Killer” frequently haunts a certain building. When CHING takes his colleagues to follow the case, he meets his son, KO TSUN SING, on the way. SING asks his father to play the game of ‘police-and-thief’ with him; CHING scolds him in anger because he is on official business to make arrest; the ‘Rose Killer’ is alerted as a result and he escapes. When CHING returns home and he tries to celebrate SING’s birthday, his son is nowhere to be found. It seems that his son evaporates into the thin air. Two years later, CHING divorces his wife, HO YEE MAN; he also leaves the Police Department and sets up a private detective office. MAN TAI PO and LAM YAN YAN, the subordinates of CHING, disguise as massage girls; they successfully obtain the criminal evidence against the targeted person. LAI TSAU is the boss of a temporary actors company.… ...