After assaulting his tactical commander during a raid gone sour, a dedicated but temperamental cop Sergeant Bill Chu is demoted to the Emergency Unit, long considered to be the police force's dumping ground for problem cops.
Narcotics officer Shaolun (Leung Ka), in order to bring down the local drug kingpin King (Michael Wong), forces a female street thug with an equally sketchy past, Coco (Kwan) to infiltrate ...