4:50 From Paddington Street by Agatha Christie (Miss Marple Mystery) Signet Books, 2000 Paperback
The inspiration for Murder she wrote came from this Book. Elspeth McGillicuddy, an old friend of Jane Marple, comes to meet Jane from Scotland. While travelling by train, Elspeth sees a murder occurring in a train on a parallel track. Since she could not have seen the victim or the killer and she is an old woman, the police ignore her. Only Jane believes her, but can she prove anything when there is not even a dead body present?