The streets of Hong Kong are a dangerous place after the sun goes down. The city has seen its fair share of crime, corruption, greedy businessmen, and murder. The date is December 22 there has been a large scale war erupting on a bustling street of the city. During the scuffle the son of a very powerful mob man has just been killed. Furious at what has just happened, the mobster hires a man named Lai Fu to investigate the crime and find his son's killer. On the path to redemption Lai Fu rescues a prostitute in distress and enlists her help in finding the killer.