Ho Mei Fong is a young woman in trouble, running from a gang of criminals with something of importance hidden in her purse. She dies in Chien Chen's taxi while trying to escape, but not before hiding the purse. Chien Chen is now involved whether he likes it or not, along with Ho Mei's sister, who turns out to be an undercover Hong Kong policewoman. They must solve the mystery of the missing purse and what it contained, while being pursued by the criminals and their hired thugs (led by Jackie Chan).