Five police officers in Hong Kong are kidnapped. The police commissioner is on a business trip overseas. Two vice commissioners, Sean Rau and M.B. Lee, then take over the case. The two vice commissioners are rivals who both vie for the police commissioner seat. At first, M.B. Lee takes the lead in the case, but comes to a dead end. Sean Lau then takes the lead, but he falls into a trap. Both men are then investigated by the ICAC (Independent Commission Against Corruption).
The undercover agent with dragon tattoo Kowloon continually helped the police to solve mysterious cases, which made him known as a rising star. However, his impulsive personality dragged him into endless troubles. He got himself into fights with the Macau detective, as well as an American Army veteran Alexander who has a secret linkage to Kowloon’s background…
CID officer Tong gets himself entangled with a gang of killers from mainland China, who are out killing criminals to rob them of their money, and using an ideological basis to justify the killings as protecting mainland China from the criminal scum of Hong Kong.
Tensions arise when Jack Chan, a spineless constable who regards his work as a job but not a career, is partnered with an energetic and conscientious policewoman, Man Liu. When a serial killer emerges in Hong Kong, Man Liu swears to catch him. Jack is impressed by her bravery and decides to secretly protect her.
In this prequel to the original, a bloody power struggle among the Triads coincides with the 1997 handover of Hong Kong, setting up the events of the first film.
Wao is 18 years old and represents a new generation of ladies in the police academy. In one occasion, she saves police officer Sergeant Chung life from a dangerous shoot out and to express his gratitude towards Chung, he assists her in graduating from the academy with disastrous consequences!
When a series of eerie murders erupts across Hong Kong, grizzled veteran Huang and his reckless younger partner Wang, are assigned to track down the killer.