Belief in possession, including from demonic forces, has ancient roots and continues into the modern world, especially among certain communities. This has been shown in books, movies, places of worship, and in the therapy office. This book traces the global history of possession and looks at ways contemporary mental health professionals can help a person who believes themselves to be possessed.Written especially for clinicians, but interesting to a wide variety of readers, this book uses a variety of disciplines, including cultural studies, psychology, and personal experiences, to try and understand the phenomenon from as wide a perspective as possible, including interviews with exorcists from various backgrounds. Both believers and sceptics will find this to be a fascinating study of a controversial topic.