Abby (1974)

aka: Possess My Soul

Director William Girdler's take on possession films about a marriage counselor (Carol Speed) who becomes possessed by a Demon of Sexuality, when her father in law (William Marshall) an Exorcist, freed it while in Africa. He returns home, along with his son (Terry Carter) and a policeman (Austin Stoker) to perform an African exorcism on her. (Much sought-after and suppressed for three decades, due to a lawsuit filed against its release soon after The Exorcist (1973) was made).