This murder mystery novel, "4:50 FROM PADDINGTON" aka "WHAT MRS. MCGILLICUDDY SAW," begins as a long time friend, (Mrs. McGillicuddy), of MISS MARPLE is returning from a shopping trip in London, aboard a train. She looks over to a train which is quickly passing hers, going the same direction and witnesses a murder. Though she reported it immediately to the conductor and then later to the police...no one except MISS MARPLE took her seriously. Intrigued by the mystery and believing her in friend, MISS MARPLE investigates. MISS MARPLE is an elderly spinster who investigates impossible murders as a hobby. AGATHA CHRISTIE was a beloved mystery writer who published more than 90 novels, plays, and movies. She died in 1976.