Grief-stricken ex-Navy SEAL-turned-detective Martin Riggs moves to California to "start over" at the LAPD. He's paired up with Roger Murtaugh, who's just coming back to the job after a near-fatal heart attack. Riggs' penchant for diving headfirst into the line of fire immediately clashes with Murtaugh's prudent, by-the-book technique. By the time their first investigation ends, Riggs realizes he may have found something worth living for – a partner and friend, Murtaugh. And even Murtaugh figures this arrangement might just work out after all. If only Riggs doesn't get them killed first…