A group of Mormons hoping to found a new colony in the trackless San Juan River country hire horse traders Travis and Sandy as wagonmaster and guide. One attraction for Sandy is "redheaded gal" Prudence. Soon they're joined by Doc Hall's broken down medicine show, with "scarlet women" Denver and Fleuretty. Then the Clegg boys, slightly psycho outlaws, decide a Mormon wagon train will make ideal camouflage...