 A mysterious veiled lady visits Poirot as he s out for a walk. She doesn t leave any name but she tells Miss Lemon she will wait for Poirot at the Athena Hotel. When Poirot and Hasting finally arrive at the Hotel and meet the mysterious lady, she tells them her name is Lady Millicent. She is about to marry a famous man but somebody blackmails her. A man has a letter she wrote when she was younger and that could ruin her reputation. The blackmailer, named Lavington, visits Poirot and tells him that, if he doesn t receive 18.000 £ before the next Tuesday evening, the letter will be delivered to Lady Millicent s husband-to-be.