A Plague of Pythons

<b>From the back cover of the DAW first printing:</b> "Something had seized his mind, something that rode his body like a speed-maniac would drive a stolen car - for he had committed atrocities against his friends and neighbors, he had done unspeakable things - and yet his own conscious mind ahd only stood aside and watched in horror. For a demonic intelligence had taken over inside his skull and left him a helpless observer. <p>He was not unique. It was happening all of the world - society was breaking down in an epidemic of crimes, vicious and senseless, and it would seem as if the world had been invaded by a legion of invisible devils from some interplanetary hell. <p>There had to be a solution, and when at last he found a clue, he set out to pursue it to the bitter end. Frederick Pohl's <i>Demon in the Skull</i> is a revision and upgrading of his <i>A Plague of Pythons</i>, bringing this classic science fiction shocker into the realtime world of 1984 and after..."

Pohl revised this novel heavily for Demon in the Skull