Wesley Cole, a former CIA agent, returns home and becomes Murtaugh's partner.
Murtaugh and Cole try to keep their footing as they work to solve the murder of a financial executive.
Cole and Murtaugh try to balance their family life with their efforts to bring down a gang running a lottery scam.
Cole and Murtaugh look back on past mistakes when Leo Getz returns as an attorney on their latest case.
Murtaugh and Cole begin their investigation after a truck full of artifacts is stolen.
Cole faces his past when his former mentor Tom Barnes reveals disturbing news.
Murtaugh turns to Cole's former mentor Tom Barnes for help on a high-stakes case.
Cole needs to talk to Natalie about their relationship.
As Cole gets into the holiday spirit for his first Christmas with Maya, Murtaugh hopes he can convince RJ to return from Costa Rica.
As Cole finds himself distracted after Natalie's engagement, Murtaugh faces many troubles at work.
Erica's mother comes to town and stirs things up between her and Cole.
Murtaugh realizes his adventures aren't as exciting as they once were when he and Cole investigate the murder of a mixed martial arts fighter.
When Cole and Murtaugh investigate a case involving a father and daughter illegally crossing the Mexican border, they end up uncovering a major problem with the California Border Patrol.
Cole throws Murtaugh's advice behind his back and reconnects with Tom Barnes for help on a personal matter.
Cole is intterogated by the FBI, forcing Murtaugh to question his loyalty to his partner.