The Plymouth Express

S3 E5: When young heiress Florence Halliday is murdered en route to Plymouth the prime suspects are a couple of known gold-diggers - her reprobate ex-husband Rupert and recent French admirer the Comte de la Rochefour. Poirot and Hastings retrace Florence's train journey to the West Country. A last sighting of Florence seeking an evening paper provides Poirot with the clue he needs to solve her murder.