When rancher Frank Tanner (Jon Cypher) hoodwinks local lawman Bob Valdez (Burt Lancaster) into shooting an innocent man, Valdez is remorseful and tries to take up a collection for the widow. Tanner won't hear of it, however, and punishes Valdez by driving him into the desert with a cross strapped to his back. Valdez is freed by one of Tanner's henchmen (Richard Jordan) and, after convalescing, begins waging a one-man war against Tanner, picking off his men with his trusty Sharps rifle.