This classic work on the subject of demns and the spirit world explores the scriptural teaching on satanic forces in a systematic fashion. After a thorough introduction on the origin of biblical demonology and a discussion on the reality of demons, Unger tackles several specific practices of demonology, including demon possession, magic, divination, and deliverance from demonic forces. A helpful and scholarly work that provides answers from the Word of God to the spirit realm, its nature and activity.