During the late 1970s, hundreds of cases were studied at The Atticus Institute, a small psychology lab founded by Dr. Henry West. Dr. West and his fellow researchers were introduced to an unusual middle-age woman whose supernatural abilities tested far beyond any subject they had ever before witnessed. This was, and to this day remains, the only government-confirmed case of possession.
After researchers at a parapsychology lab realize their newest test subject is possessed by an evil entity, the U.S. Government intervenes and subsequently takes total control. The research institute's founder, Dr. Henry West, and his team soon uncover that the government's intention is to weaponise the demon and make use, for military purposes, its uncanny powers.