John Paul II was the first pope since the early 1600s to view the evil and his minions not only as formidable foes, but as tangible forces which the Catholic church must battle on a daily basis. The priest charged with spearheading this mission is Father Gabriele Amorth and his Office of Exorcism. Revitalising a long-dormant practice, Father Amorth has re-established exorcism as a common rite in the church with a series of seminars and training sessions during which priests from all over the world learn how to fight Satan here on Earth. Tracy Wilkinson gained access to the Vatican's highest authorities,allowing her to cover this story from every angle - both beneficiaries and victims of exorcism, sceptical scientists, devout believers and even those priests within the church who question the revival of the practice.