This study considers, in an objective manner, the evidence for genuine possession, the history of recorded cases, the similarities between the attitude of different religions and the offical views of the Church. It is now almost two decades since the film The Exorcist was released. The movie not only haunted countless cinema audiences, but also rekindled the debate within religious circles about the place of exorcism in the 20th century. The author has spoken to many people who claim to be conducting exorcism in various forms. There is the Church of England minister called to exorcise a young boy who, allegedly possessed by an evil spirit, displayed superhuman strength, spoke in a terrifying voice and whose bedroom filled with an eerie blue light. There is the Catholic priest who was asked to exorcise a London bank where bizarre voices were heard on the intercom system and objects regularly flew about. The author has also written The Search For Heaven On Earth.