Ma Jun, a cop known for dispensing justice during arrests, teams with Hua Sheng, who`s undercover, to try to bring down three merciless Vietnamese brothers running a smuggling ring in the months before the mainland`s takeover of Hong Kong. The eldest, Xian Wei Cha (called Zah), is arrested in an operation that exposes Sheng and almost gets him killed. His girlfriend, Qiu Di, who`s been unaware of Sheng`s profession, wants to see him quit. Jun pursues the gang tirelessly, sometimes ignoring police protocols. Zah`s trial approaches, witnesses are in danger, and a showdown is inevitable