Warrior Tuan Changqing (Ti Lung) meets courtesan Liu Yinxi (Shih Szu) in a small town. Liu pleads Tuan to kill underworld master Guo Tiansheng (Ku Feng), known as the "Killer Doctor", in oder to avenge the death of her fiance. Tuan and casino security guard Xiao Dao (Alexander Fu Sheng) breaks into Guo's household and triggering the battle of good against evil.