Overview
Lady on a Train is a 1945 American light-hearted comedy crime film directed by Charles David and starring Deanna Durbin, Ralph Bellamy, and David Bruce.
Based on a story by Leslie Charteris, the film is about a woman who witnesses a murder in a nearby building from her train window. After she reports the murder to the police, who quickly dismiss her story, she turns to a popular mystery writer to help her solve the crime. The film received an Academy Award nomination for Best Sound.
Plot
San Francisco debutante Nicki Collins goes to visit her aunt in New York. Her father's employee, Haskell, is to meet her and facilitate her stay. Before reaching Grand Central, Nicki's train makes a brief stop and, when she looks up from the book she is reading - a mystery by novelist Wayne Morgan - she witnesses a murder in a nearby building.
Upon arrival, she slips away from Haskell and goes to the police, but the desk sergeant, seeing the novel in her hand, assumes she imagined the crime. She decides that Wayne Morgan must be able to solve a murder, finds him, and pesters him to get involved. Following Morgan and his fiancee into a theater, she sees a newsreel about the "accidental" death of shipping magnate Josiah Waring—and recognizes him as the murder victim.
From Wikipedia (CC BY-SA 4.0).