Watching Martin Riggs wrestle with this news and its implications would ordinarily give Roger Murtaugh plenty of entertainment, were it not for the fact that his daughter Rianne is also pregnant, and is not willing to reveal the identity of the father. The two men attempt to make sense of their situations while investigating an Asian immigrant smuggling ring. Their leads converge on a man named Wah Sing Ku (Chines action star Let Li), a fiercely disciplined Asian Triad princeling bent on a complex and deadly mission. Things are further complicated by the presence of Leo Getz (Joe Pesci), a former small-time crook who's become a private eye in order to work with his heroes, Riggs and Murtaugh.