Detective Sergeant Ma Jun (Donnie Yen), known for dispensing his own brand of justice during arrests, teams up with an undercover cop, Wilson (Louis Koo), to try and bring down three merciless Vietnamese brothers (Collin Chou, Lui Leung-Wai, and Xing Yu) running a smuggling ring in the months before mainland China's takeover of Hong Kong. Jun pursues the gang tirelessly, sometimes ignoring police protocols. A showdown is inevitable!