Plot

A mining entrepreneur hires Poirot to solve the brutal murder of his daughter and the theft of her jewels aboard the express train to Plymouth.

Poirot investigates the death of Florence Carrington, who was murdered while traveling on the express train to Plymouth. Her father, mining entrepreneur Gordon Halliday, will spare no expense to have the crime solved. She had recently been approached by her estranged husband Rupert - who was asking for money - and was seen having lunch with a one-time suitor, Armand de la Rochefort, of whom her father disapproves. However, the victim's jewelry was stolen, and Poirot realizes that to find the murderer, they must first find the jewels.—garykmcd

Poirot is hired by Australian mining magnate Gordon Halliday to investigate Comte De La Rochefour, a man who is courting his daughter, Florence Carrington. Halliday is very protective of his daughter. A few days later Florence is murdered on the Plymouth Express and the priceless jewels she was carrying stolen. De La Rochefour turns out to be a rather unscrupulous businessman and is the prime suspect. Also under suspicion is Florence's estranged husband, Rupert Carrington.—grantss