“Gaslight” (1944)

An emotionally fragile woman marries a dominating husband. Slowly, day by day, she becomes more convinced that there is something wrong. That he has sinister designs. But he is slowly dismantling her belief that her own perceptions are accurate. Day by day, night by night, she begins to lose touch with reality. Question her mind. Is she insane?

She apparently hallucinates. Remembers things that never happened, and forget things that have. If she trusts her husband, she cannot trust her mind....