The Trail of the Serpent by Mary Elizabeth Braddon

LAURENT BLUROSSET was a sort of rage at the West-end of London. What did they seek, these weary denizens of the West-end, but excitement? Excitement! No matter how obtained. If Laurent Blurosset were a magician, so much the better; if he had sold himself to the devil, so much the better again, and so much the more exciting. There was something almost approaching to a sensation in making a morning call upon a gentleman who had possibly entered into a contract with Sathanus, or put his name on the back of a bit of stamped paper payable at sight to Lucifer himself. And then there was the slightest chance, the faintest shadow of a probability, of meeting the proprietor of the gentleman they called upon; and what could be more delightful than that? How did he visit Marlborough Street -- the proprietor? Had he a pass-key to the hall-door? or did he leave his card with the servant, like any other of the gentlemen his pupils and allies? Or did he rise through a trap in the Brussels carpet in the drawing-room? or slide through one of the sham Wouvermanns that adorned the walls? At any rate, a visit to the mysterious chemist of Marlborough Street was about the best thing to do at this fag-end of the worn-out London season; and Monsieur Laurent Blurosset was considered a great deal better than the Opera.

It was growing dusk on the evening on which there was so much excitement in the little surgery in Friar Street, when a plain close carriage stopped at Monsieur Blurosset's door, and a lady alighted thickly veiled. The graceful but haughty head is one we know. It is Valerie, who, in the depth of her misery, comes to this man, who is in part the author of that misery.