A cowboy turned G-Man looks into a series of mysterious plane crashes in this low-budget but fairly engrossing B-Western starring Tim McCoy. Masquerading as an outlaw, Tim Caverly manages to infiltrate a gang of mail thieves holed up in a ghost town. As Tim discovers, the gang leaders, Dawson (Walter Miller) and Kincaid (Wheeler Oakman), have kidnapped Professor Brent (Lloyd Ingraham), whose electrical ray gun is used to shoot down the planes. Also arriving at the hideout is Natalie (Claudia Dell), the professor's pretty daughter, who warns her father that women and children were among the victims of the latest crash. Although Dawson is suspecting Tim to be a G-Man, the villain orders Brent to shoot down an incoming government plane. There is an exchange of gunfire between Dawson and Tim, and Brent is shot attempting to shut off the ray gun. The professor survives, however, and the villains are apprehended.