Joshua Guymon is a small town sheriff in the mostly Mormon Star Valley of Wyoming Territory. This is back in the days when to be Mormon was to be an outsider in the American West. His younger prodigal brother seems to have settled down from his wild ways and married. Joshua goes to meet his brother's bride and see how the newlyweds are doing on a ranch in the southern part of the territory. But trouble has a way of finding Joshua, from a crooked gambler to a highwayman, to an escaped prison killer. What starts out as a social visit to his brother becomes a western adventure and a decision between his faith and being a U.S. Deputy Marshall.