Frederik Pohl 
Plague of Pythons [EPUB ebook] 

On Christmas the world’s freedom died. Every man, woman and child lay in the grip of fear, for no one knew at what moment his nearest friend or a casual stranger might suddenly be possessed by some brutal mind … and begin to murder and destroy. For Chandler it was worse than for most. He was both victim and executioner. He had suffered himself, and he had committed a violent crime while under the strange domination. Accusing of hoaxing he was driven from his home. He wandered the world and found it smashed like a spoiled child’s plaything — now Chandler was in the very presence of the destroyers! But what could one person do against such power? — the power of gods!