The Mystery of the Blue Train – On the lavish Blue train from London to the Riviera, Ruth Kettering, the pet daughter of a millionaire murdered, was robbed of jewels expensive. While the responsibility was attributed to the infamous jewelry thief nicknamed ‘Marquis’, Poirot directed suspicions about Ruth’s family, about her unhappy marriage. And moreover, a witness stood out claiming to see Ruth’s furry husband, Derek, enter her compartment before she was murdered … Genre stories about gangster.