Gaslight (released in the United States as Angel Street) is a 1940 British psychological thriller directed by Thorold Dickinson starring Anton Walbrook and Diana Wynyard, and features Frank Pettingell.

The play had been performed on Broadway as Angel Street,[2] so when the MGM remake was released in the United States, it was given the same title as the American production.

In Pimlico, London, Alice Barlow (Marie Wright) is murdered by an unknown man, who then ransacks her house, ripping her furniture apart as if desperately searching for something.

Bella (Diana Wynyard) soon finds herself misplacing small objects; and, before long, Paul (Anton Walbrook) has her believing she is losing her sanity.

The sinister interpretation of the change in light levels is part of a larger pattern of deception to which Paul subjects Bella, including berating her for losing a brooch, which he had hidden inside his locked rolltop desk.

[3] Leonard Maltin gave the film 3+1⁄2 stars (out of 4): "Electrifying atmosphere, delicious performances, and a succinctly conveyed sense of madness, and evil lurking beneath the surface of the ordinary".