Dave Harmon (Clint Walker) is the new sheriff in Yuma, Ariz., and he has his hands full as soon as he arrives. Brothers Sam (Bruce Glover) and Rol King (Neil Russell) hold up a stagecoach, and Harmon slaps them in jail. When Rol is killed in an attempted escape, Harmon is wrongly accused of shooting him, and the Kings' big brother, Arch (Morgan Woodward), will not stand for it. Hoping to avoid another killing, Harmon vows to catch Rol's killer and put things to right.