A lot has changed in 20 years.
A high-profile reporter and close friend of Frank is nearly assaulted while she is out with him, and Danny and Jackie search for the would-be attacker. Meanwhile, Jamie's undercover case comes to a critical stage.
As the cop buddy duo of Riggs and Murtaugh start to show their age, they team up with a newcomer to try and defeat a deadly LA gang for good.
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