Montague Summers was a Roman Catholic priest, whom, it has been speculated, dabbled in the Black Arts. He wrote many scholarly books about the witch hunts, vampires, werewolves, and other occult subjects. In this book, Summers investigates the vampire phenomena from the perspective of the Catholic church; that there are real, dark forces in this world, that can take human form, and walk the Earth, seeking the ruin of souls. This work is complete with extensive footnotes, scholarly references and a bibliography.