Follows two infamous London gangsters, Mickey Mannock and Ray Collishaw. Both men are top of the food chain when their world is turned upside down as they lose a shipment of the Russian Mafia's cocaine.
During China's Tang dynasty the emperor has taken the princess of a neighboring province as wife. She has borne him two sons and raised his eldest. Now his control over his dominion is complete, including the royal family itself.
A veteran policeman, Murtaugh, is partnered with a younger, suicidal officer, Riggs. They both have one thing in common: hating working in pairs. Now they must learn to work with one another to stop a gang of drug smugglers.