Paris, 1888. With the help of forensic medicine, a sensational criminal case is uncovered. The chief of the Paris Sûreté, Inspector Goron, with the help of Lyon University Professor Lacassagne, is able to solve a capital crime that seemed unsolvable according to the methods of forensic science at the time.
A couple is suffering from sexual estrangement. The husband is having an affair with his secretary and the wife takes up with Sandra an interior decorator.
Two rival street gangs from Kowloon go to war over turf and bar girls so as to dominate the area and maximize their takings; however things go from bad to worse as the girls start to get involved in the bloody feud.
Don Serafin has a complex: to all the beautiful women always seen with a beard. To remove the complex and try to cure him, his friends will lead to Biarritz.