Ho Mei Fong is a young woman caught up in a gang and trying desperately to get out. The gang will stop at nothing to hunt her down. While on the run she steps into the cab of Chien Chin, an honest hardworking cabdriver. She dies on route to the hospital. Chien Chin then becomes the target of the ruthless gang, who believe he has Ho Mei Fong's purse. Jackie Chan stars as the bloodthirsty leader of the gang, who with his band of thugs will stop at nothing to find it. Helping Chien out is Ho Mei Fong's long lost sister, a police woman and martial arts master. Together they try to unlock the mystery of the missing purse and recover it before the gang does them in.