While watching from her train window, Nikki Collins witnesses a murder in a nearby building. When she alerts the police, they think she has read one too many mystery novels. She then enlists a popular mystery writer to help her solve the crime on her own, but her sleuthing attracts the attentions of suitors and killers.
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Lady on a Train is a 1945 American crime comedy film noir directed by Charles David and starring Deanna Durbin, Ralph Bellamy, and David Bruce.