D.J. Anderson

Sixties couples Michael and Donna and Paul and Erica become involved with the intense Count Yorga at a Los Angeles seance, the Count having latterly been involved with Erica's just-dead mother. After taking the Count home, Paul and Erica are waylayed, and next day a listless Erica is diagnosed by their doctor as having lost a lot of blood... (imdb)

A biker gang visits a monastery where they encounter black-robed monks engaged in worshiping Satan. (imdb)

Grace Macdonald, a disturbed young woman obssessed with finding her father she never knew, becomes lost In her warped sense of reality and fantasy. Her mind creates a father (Edmund O'brien) and a home. To protect her sordid fantasy world she is forced to commit atrocious, bizarre murders and seeks out and destroys her unfaithful boyfriend. (Amazon)