Out chasing outlaws Texas Ranger Cal Avery comes across a wrecked stagecoach, and a dead man and woman nearby. In a gully, under a juniper bush, lies another young woman, thrown clear when the coach went over and who cannot remember anything. When a cavalry supply train comes along with Avery's old friend, Jumbo Jepson, as the lead teamster, he decides that travelling with them is the best course of action. But in Cal's absence, unscrupulous Indian Agent, Jake Elkins, has bribed men to swear that Cal has gunned down two innocent men in cold blood, and now there is a warrant out for his arrest. The travellers must head for the safety of Fort Griffin, avoiding the pursuing Indians, and the corrupt law, who are trying to halt their progress...