 Steve Ranson (Charles Starrett), an ex-Texas Ranger, is called upon by Gregory Banion (Charles Evans), manager of the Trans-Western Railroad, to solve a series of mysterious attacks on the railroad s surveying parties along the Ranahan Trail, Jeff Carson (Hugh Prosser), owner of the stage line which will lose business when the railroad is completed, is the primary suspect. Steve, as the Durango Kid, foils an attempt on Carson s life and believes him when he says he is not responsible for the raids. They join forces and, with the aid of town gunsmith Smiley (Smiley Burnette), they uncover the real outlaw leader.