In 1920s China, Shanghai is divided by infighting amongst mobsters, spies, officials and the military, all seeking to gain control of the country with no regard for it's citizens. Determined to subvert the Japanese invasion, Chen Zhen, believed to be dead and using a false name, returns from the war in Europe. During the day he appears as a wealthy playboy, but at night he takes to the streets as a mysterious masked warrior with amazing skills and an impossible mission.