Davy Hackett (James Darren) and his hot-tempered, arrogant older brother Ed (Tab Hunter) are about to assist their rancher father Lee (Van Heflin) on a cattle drive to Wyoming. The brothers meet Cecily "Clee" Chouard (Kathryn Crosby), a beautiful half-French, half-Sioux woman, and when Ed makes unwanted advances toward her, Davy intervenes.