The Sign of the Stranger by William le Queux

"The woman Marie Lejeune quickly developed from the smart ladies' maid of the Comtesse de Martigny, a gay Parisienne, into the shrewdest and cleverest of adventuresses, and aided by the two Italians, made several large and successful coups at Vichy, Aix-les-Bains, and elsewhere," continued the man Logan, speaking in the same clear, decisive tones, addressing the Earl. "I, however, had parted from them, and was conducting an honest business in London, while Mr Keene had left on a shooting expedition in Africa, where he afterwards met you, and I presume gave his name as Smeeton in order that you should not connect him with the person who had been at San Remo that season.

"Until your marriage, the Frenchwoman did not trouble your wife nor Lolita in the least. She waited her time until Lady Marigold had married and was wealthy and you returned to London from your honeymoon in Cairo, when one day she called at Stanchester House, saw the Countess, and by showing her the letter she had written to Atherton succeeded in extracting blackmail from her, a course which she has continued until quite recently. And not only this," he added, "but she approached Lolita secretly and made large requests, threatening that if they were not complied with she would denounce her as the murderess of poor Randolph Glover at San Remo! Her ladyship, helpless and terrified, was forced to comply with these demands although entirely innocent of the crime.