Two Los Angeles police officers with divergent personalities are unwillingly teamed in a fight against an international heroin ring; Los Angeles buddy-cops Riggs and Murtaugh are off and running again, as they try to keep a key witness and themselves alive; Murtaugh is days away from retirement, and is relectant to get involved with his partner's schemes; Martin Riggs and Roger Murtaugh are put on a hit list by the Chinese Triads and when blood thirsty mercenaries are on their tail, they team up with LeoGetz and a new cop to finally put an end to the group.