The Sacred Herb by Fergus Hume — Read

After all, Lord Prelice did not return to Hythe on that night, much as he desired to. In view of this new complication, which threatened the domestic peace of Lady Sophia Haken, her nephew decided to remain in London, and give all his energies towards solving the problem. He could not think that Haken had anything to do with the murder of Agstone. In the first place, he had no reason to kill the man; in the second, he did not possess any leaves of the Sacred Herb with which to make Shepworth unconscious. Certainly it was Agstone who had kindled the leaves in the bronze cup, but he must have obtained them from Mr. Haken -- presuming he was the disguised lady -- -since he could have obtained them in no other way. Sir Oliver had possessed a portion of the plant, but had used it in the library when he was murdered, so the old sailor could not have procured the leaves in that direction. Prelice began to wonder if Haken had got the leaves from Madame Marie Eppingrave to execute his purpose.

But then, so far as Prelice knew, his uncle was not acquainted with the Bond Street fortune-teller. And again, he was well acquainted with Dr. Horace, who admitted to possession of the leaves, and, more than this, had actually burnt the Sacred Herb in the New Bailey. Lord Prelice decided first to call upon his uncle in the city, and lay the facts discovered before him, and then to interview Dr. Horace. In these two several ways he might get at the truth. Also, somewhat later, he decided to again speak with Madame Marie, and if possible see her in the presence of Captain Jadby. When that buccaneer learned that Mona was engaged to another man, and that she had inherited the property, he might bow to fate and leave things alone. Finally, Prelice knew that he had a powerful ally in the fortune-teller. From what he had seen of her strong-willed character he guessed that she would stick at nothing to secure as her husband the man with whom she was infatuated.