They call it Ephemerol II. The only drug powerful enough to control the growing population of Scanners, a group of special people with telepathic powers so refined that they can manipulate all those whose paths they cross. Murder blends with mayhem as a young Scanner named David Ketchum and his girlfriend, Alice Leonardo, race against time to stop the effort of a corrupt police commander and a disillusioned doctor. By controlling the supply of Ephemerol II, the two men have turned a group of Scanners into virtual slaves, willing to stop at nothing to get their next fix of the highly addicting drug. And if David isn't careful, he may be the next target.