Undercover government agent Randy Bowers (John Wayne) rides into a small town, happening upon a saloon that's just been shot up. Wary of the newcomer, the sheriff (Earle Dwire) arrests Randy for the murders, but the saloon owner's niece, Sally Rogers (Alberta Vaughn), helps him escape because she knows he didn't do it. Randy then sets out to find the man behind the murders and is led to an evil mastermind named Marvin Black (George Hayes), who has been passing himself off as an innocent mute.