As the sole heir of huge wealth, young Florence has become the target pursued by a large group of people who are greedy for money and close to profit. At his father's request, Poirot promised to observe his suitors. One weekend, Florence was assassinated on the Plymouth express train bound for Stowe. Her body was hidden under the seat of the box, and a box full of jewels was missing. The clues provided by the servant showed that there was a stranger with dark hair at that time. ..