This is a combination comedy, crime drama, horror & sexploitation film. It doesn't do any one of these great but well enough that together it's an above average movie.
The IMDB plot description is (as frequently the case) not accurate. We don't know who did the killing until near the end. It's more accurate to say, the movie is both the investigation of the killings as well as what provoked the killings.
The police are more the comedy, played in a slapstick style. Yes they actually investigate tho almost everything they do is played for laughs. Unfortunately, it doesn't work much of the time but there are a few laughs. They are part of the crime drama tho that's mostly played out in the story of what lead to the killings. That part is also the sexploitation with several sex scenes. Nothing real graphic but there is nudity and simulated sex. The killings themselves are the horror part as it's fairly graphic violence with several quarts of blood. The script did a fantastic job of weaving everything together. This movie fits every category of a Cat III movie.
While most of the cast are just alright. The female lead Lily Chung is excellent. Part of the reason this movie works. Yes she is beautiful but more importantly she can act. Ka-Kui Ho, who plays her father is outstanding. His facial expressions really fit the part.
This movie may not be for everyone. Some may not like the violence. Some the nudity. Some may not find anything funny. It's the movie in its entirety that make it a very good movie. Worth watching!