Person walking away as beach house explodes – film noir? Can’t remember the title.

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I think this is a b/w film. Someone is in a house on the beach. I think they were tricked in being there. They may be in peril. I think the phone rings (a doctor?) or they see something on a desk. Person manages to turn on the gas stove and get out of the house. I think the movie ends as the house explodes. We see people run towards the house, but the person (who escaped?) is walking away and doesn’t look back. I can’t even remember if the person is a woman or a man. It may be film noir.

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