A millionaire strikes a deal on the seedier side of Paris & a priceless cache of rubies becomes destined for his beloved daughter Rachel. Two days later Rachel is dead
- murdered on a train on her way to the Riviera to meet her scoundrel lover: a mysterious dark man. The suspects line up...only master slueth Hercule Poirot can unravel the mystery & find the truth. Maurice Denhham stars as the great Belgian detective in this BBC Radio 4 full-cast dramatisation.