4.50 from Paddington
For a time the two trains ran in parallel. At the moment when they gave the illusion of being stationary Mrs McGillicuddy looked into the lighted first-class carriage that was only a few feet away. She saw a man, standing with his back to the window, strangling a woman to death. But no one believed Mrs McGillicuddy when she reported what she had seen – no one, that is, except her friend, Miss Marple.