Abby (1974)

Living with her pious pastor husband and her equally religious mother, the prim, proper and polite Christian marriage counselor Abby Williams is about to have a close encounter with the supernatural when her archaeologist and exorcist father-in-law, Bishop Garnet Williams, inadvertently unleashes an ancient evil while in Africa. Now possessed by an unholy Nigerian demon, Abby becomes a violent, obscene and sexually obsessed vessel of pure evil and it appears nothing can stop her or the entity that controls her. Can Bishop Williams expel the demon inside her?