The Plymouth Express Affair

Halliday rang the bell, and gave a short order to the footman. A few minutes later Jane Mason entered the room, a respectable, hard-featured woman, as emotionless in the face of tragedy as only a good servant can be. Poirot picked up a pin from the carpet, and frowned at it severely; then he continued: “Would it be possible for the man to have entered the train at Bristol before you reached the carriage?”