Extraterrestrial intelligences operate on Earth undetected by the public. The largest, worldwide security service Life-Int-Ltd. becomes aware of this. Sigurd Westall, a new employee of the corporation, is sent to investigate the aliens right after his basic training. No one, except his immediate superior, knows that he has had a special ability since puberty. He is assigned to a team of specialists who set out to track down the aliens. When it comes to a direct confrontation, it is only thanks to this ability that he survives.