 Arizona Ranger Boone Yeager (George O Brien), working undercover, is ostracized by his sweetheart, Letty Meade (Laraine Day as Laraine Johnson), and others of the Pinyon community for his association with a gang of bandits, led by Whiskey Joe (Harry Cording). When he joins them in a stagecoach robbery, he purposely leads them into an ambush by the U.S. Army. He, awaiting proof of his credentials, is also jailed. Having learned that Commissioner Teagle (Tom Chatterton) is the secret leader of the gang, Boone, aided by his friend Whooper Hatch (Chill Wills), breaks jail and goes after Teagle and his aide Kirby (Glenn Strange).