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In this uneven mystery-thriller by Philip Chan, little Edith sees her mother stabbed to death by a "night caller" disguised in a raincoat and hat and then is so traumatized that she loses her ability to speak. Three CID inspectors take up the case: the intrepid James Wong (Melvin Wong) his partner Steven Chan (Philip Chan), and a newcomer to the police detective squad "Porky" (Pat Ha). After Detective Wong finds a tape inside the doll Edith was holding during the murder, he plays it, and the identity of the killer is revealed. Anxious to close in on the murderer, he decides to go it alone -- and ends up on the receiving end of the killer's wrath. Parents should be advised that sex, lesbianism, and torture are a part of the storyline.