The Mystery of the Blue Train, another Poirot mystery by Agatha Christie,  American millionaire Rufus Van Aldin has bought the famous Heart of Fire, among other massive rubies, as a little no-occasion gift for his daughter Ruth. When he goes to visit her and give her this gift, though, he can’t bear to see her unhappiness in her marriage, and Rufus tries to convince his daughter to  divorce her husband. This is old-time British divorce, which means private investigators and evidence of adultery, there’s no way to do a no-fault split. Ruth would like to be free of her cheating husband, but she’s worried that an investigation into her marriage will turn up not only her husband’s mistress, Mirelle, but her own friendship with Comte de la Roche.

The Van Aldins are loaded, of...

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