J.J. McQuade is a Texas Ranger who doesn't methodically apply the rules, is unruly, and prefers to work alone, which earns the handle, Lone Wolf McQuade. When he discovers some criminals have automatic weapons, he discovers that they were stolen from the military. He tries to control on his own, as usual, but in the destination, an old friend, and a prisoner, whom he was keeping wraps, are killed. He is then relieved of customs. But then an FBI agent, who also wants to outsmart these guys, offers to help McQuade, and along with a rookie, they track down the out.