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Bill (John Phillip Law), a boy whose her was killed and mother and sister were raped and murdered in front of him by a gang, sets out 15 years later to exact revenge, having used the time to become an expert marksman with a . Each of the outlaws bears a characteristic that Bill memorized while watching his family slaughtered. One has a tattoo of four aces on his chest, another a , one a distinctive earring and one a necklace bearing a skull. As he begins his journey, a fighter named Ryan (Lee Van Cleef) is released from a prison after serving 15 years there. He was framed for an armed robbery by the very men who murdered Bill's family. When they meet along the way, Ryan gets the better of Bill, who is blinded by vengeance, but he does Bill no harm. When the tables are turned later, Bill reciprocates, helping Ryan escape from a jail. But even though Bill has successfully killed the man with the aces tattoo, the more experienced Ryan insists on tracking the other outlaws alone. An equally determined Bill sets out ahead of him. Bill is captured by the outlaws, beaten and buried alive from the neck down. Left to die in the hot sun, he is rescued by Ryan, who shoots several men standing guard. Preparing for the gang's return, Bill notices that Ryan is wearing a necklace with a skull. Ryan admits he was present during the murders. He gives his word that once the outlaws have been dealt with, he will remain to face whatever justice Bill seeks. In a final shootout during a sand storm, the last remaining man who killed Bill's family has him dead to rights, only to be killed by Ryan's thrown . Bill nonetheless insists on revenge. Ryan's is empty, so Bill tosses a bullet to him. He has just one bullet left now himself. Ryan turns his back and walks away, daring Bill to shoot him in the back. Bill fires, but it is only to kill a surviving outlaw. A grateful Ryan then watches him ride away.