Feast Of Satan (1971)

aka’s: Las Amantes Del Diablo/
I Diabolici Convegni

A woman (Krista Nell) searching for her missing sister arrives at a small coastal village, where her sister (Verónica Luján) was last seen. Unknown to her, her arrival has been noted by a crazed scientist (Espartaco Santoni), who has designs on her. Also stars Teresa Gimpera.