Following the death of his wife, Los Angeles police detective Martin Riggs becomes reckless and suicidal. When he is reassigned and partnered with Roger Murtaugh , Riggs immediately clashes with the older officer. Together they uncover a massive drug-trafficking ring. As they encounter increasingly dangerous situations, Riggs and Murtaugh begin to form a bond. Riggs' volatile behavior might just help them apprehend the criminals -- if it doesn't kill them both first.