 Los Angeles P.D. officers Roger Murtaugh (Glover) & Martin Riggs (Gibson) are back, and this time they are chasing a thug in a red BMW. When the car crashes, several million dollars in Krugerand - South African currency - spill out of the trunk. After Murtaugh is ambushed in his home by a group of South African thugs, they speculate that the vehicle they were chasing may be linked. When their captain assigns them to guard a witness (Pesci) in a drug case, they soon find out that the drug dealers the witness was dealing with are South African diplomats hiding behind their immunity to carry out cocaine smuggling. Riggs also discovers that one of the consulate employees is in fact the murderer of his wife! After the thugs kill a consul secretary Riggs was in love with, and several fellow police officers are murdered by the diplomats, Riggs & Murtaugh exact angry, bloody revenge against the psychopathic drug-dealing diplomats...