Riggs plans to finish off Tito Flores in Mexico where Murtaugh follows him.

Riggs and Murtaugh uncover a drug ring at a wellness clinic while investigating a plastic surgeon's death.

Murtaugh and Riggs search for an unreliable father who committed a robbery 20,000 feet in the air with his daughter as the main witness.

Riggs and Murtaugh investigate a surfer's death.

Riggs and Murtaugh investigate a murder in a hospital that leads them to the underworld.

Riggs and Murtaugh are drawn into a fatal world of conspiracy theories. Meanwhile, Riggs' relationship with Molly evolves and Murtaugh and Trish attempt to get Harper into a fancy pre-school.

Murtaugh's Christmas vacation in Hawaii is put on hold when he and Riggs are called to a homicide and the victim is an old friend.

A secret about Riggs' deceased wife is revealed when he visits his father-in-law in prison.

Murtaugh and Riggs search for the culprit of a local jewelry heist; Murtaugh gets called "grandpa" by another parent while at the playground with Harper sending him into a tizzy; Riggs deals with withdrawal from drinking.

Riggs and Murtaugh are on the case of a hitman who Murtaugh has been following for almost 17 years.

When Leo decides to 'Getz' married, 'surprisingly' nothing goes smoothly.