During the 1880s, Englishman Jonathan Tibbs (Kenneth More) journeys to the American West to make a fortune selling firearms. However, when he stops a Native American ambush using his gentlemanly manners, he becomes a hero to the people of the town of Fractured Jaw and is made sheriff. In over his head, Jonathan attempts to bring justice to the anarchic town by befriending a local Sioux tribe. He also tries to win over Kate (Jayne Mansfield), a feisty bartender.