Blacker Than the Night (1975)

Four women settle into a decrepit house inherited from one of their aunts, only to be met with chilling occurrences. Eerie voices, ghostly apparitions, and unsettling sounds permeate their new home, plunging them into a harrowing exploration of dark forces at play. As they delve deeper into the house's sinister secrets, they confront an overwhelming presence of evil that challenges their sanity and courage, revealing horrors that transcend their worst nightmares.