TO THE DEVIL A DAUGHTER (1976)

An occult novelist battles to save the soul of a young girl from a group of Satanists, led by an excommunicated priest, who plan on using her as the representative of the Devil on Earth...

demons of the mind

DEMONS OF THE MIND (1972)

A physician discovers that two children are being kept imprisoned in their house by their father. He investigates and discovers a web of sex, incest, and satanic possession.