The Royal Hong Kong Police Force is planning a major undercover sting called "Operation Boar Hunt" to arrest crime lord Chu Tao (Yuen Chor).

Inspector Chan Ka-Kui (or Kevin Chan in some versions) is part of the operation, along with undercover officers stationed in a shanty town. However, the criminals spot the police and the ensuing car chase cuts through the hillside shanty town, vehicles destroying the shacks and causing large explosions.

Ka-Kui persists in his chase, eventually following on foot as the drug lord attempts to escape in a double-decker bus. Ka Kui catches the bus and initially is able to hang on to it using an umbrella, but is thrown off. He then manages to get in front of the bus and bring it to a halt by threatening to shoot the driver with his service revolver.

Ka-Kui is reprimanded by Superintendent Li for letting the operation get out of hand, but is subsequently presented to the media as a model police officer.

His next assignment is to p ...more