That unexpected knock at the door. A man and woman, strangers, stand outside your home. They casually offer you a ticket to heaven like it's for your favourite band in concert. Unlike your stereotypical groupie, the enthusiasm and dedication these religious fanatics demonstrate could be the result of hypnotic influence. Psychologist and hypnotherapist A.S. Hill uncovers the camouflaged hypnotic techniques used to recruit 'mental slaves' and warns us about Pentecostal and Revivalist groups.