Synopsis for
Gaslight (1944) More at IMDbPro »

Why does the flame go down? Lights in the London house are from fixtures with gas flames, and when you light one light, it reduces gas supply to the other lights in the house that are close by, and the light dims. But no one in the house has lit any other lights! And there are also footsteps overhead, from a nailed closed attic. Neither of the two servant ladies sees or hears either of these signs. Paula Anton (Ingrid Bergman) thinks she is losing her mind, just as she has lost the broach her husband Gregory (Charles Boyer) gave her. Her new marriage is falling apart; she cannot go out lest she make another embarrassing scene. Is it the house? The house where her aunt, a famous and beautiful concert singer, had been murdered when the young Paula was actually in the house. What does her new husband, who plays the piano beautifully, do for a living? Nothing. Why does he go out every night and leave her alone, alone to fret and worry? Who is the man who sees them at unexpected times and places, a man we the audience soon learn is Brian Cameron (Joseph Cotton), a Scotland Yard detective. He is curious about the unsolved murder of Alice Alquist, the aunt who looked a great deal like the beautiful Paula does now; it was a murder that defied the investigators. No motive, no suspects. No clues. You now have the clues to this Oscar winning (Best Actress) dark mystery. Introducing (first picture) Angela Lansbury (Best Supporting Actress nominee) in the role of one of the servants. Also nominated for Best Picture, Best Actor (Boyer), and three more.