Let's Scare Jessica to Death (1971)

Recently discharged from a mental institution, Jessica yearns for a return to her former, stable life. However, her hopes are dashed when she relocates to a remote country house with her husband and a close friend, only to discover a strange girl already inhabiting the space. As unsettling events unfold, Jessica’s anxieties intensify, and she becomes increasingly convinced that sinister forces are at play. The line between reality and madness blurs, plunging her into a nightmarish struggle for her sanity and safety.