A British military paratrooper disappears in mid-air during a jump from an army plane. Two investigators, Patrick Allen and Neil Connery, try to unravel how this happened. What they uncover is an alien plot to steal the bodies of earthlings by snatching them out of the air.

The evil crime syndicate Thanatos is bent on taking over the world, using a magnetic wave generator that will cause all metal-based machinery to grind to a halt. However, the well-known British secret agent normally assigned to such tasks isn't available, so they engage his civilian brother, Neil, to help. Neil, played by Neil Connery, is a world-class plastic surgeon, hypnotist, and lip-reader, which turn out to be precisely the skills required for thwarting Thanatos.