"I believe I am," I answered, not without emotion; "and I am more rejoiced at your offer and more grateful than I can tell you. But we must leave the final arrangements for our next meeting—in a week or so, I hope—for I have to be back in an hour, and I want to consult you on a matter of some importance."

"Very well," said Thorndyke; "we will leave the formal agreement for consideration at our next meeting. What is it that you want my opinion on?"

"The fact is," I said, "I am in a rather awkward dilemma, and I want you to tell me what you think I ought to do."

Thorndyke paused in the act of refilling my cup and glanced at me with unmistakable anxiety.

"Nothing of an unpleasant nature, I hope," said he.

"No, no; nothing of that kind," I answered with a smile as I interpreted the euphemism; for "something unpleasant," in the case of a young and reasonably presentable medical man is ordinarily the equivalent of trouble with the female of his species. "It is nothing that concerns me personally at all," I continued; "it is a question of professional responsibility. But I had better give you an account of the affair in a complete narrative, as I know that you like to have your data in a regular and consecutive order."

Thereupon I proceeded to relate the history of my visit to the mysterious Mr. Graves, not omitting any single circumstance or detail that I could recollect.

Thorndyke listened from the very beginning of my story with the closest attention. His face was the most impassive that I have ever seen; ordinarily as inscrutable as a bronze mask; but to me, who knew him intimately, there was a certain something—a change of colour, perhaps, or an additional sparkle of the eye—that told me when his curious passion for investigation was fully aroused. And now, as I told him of that weird journey and the strange, secret house to which it had brought me, I could see that it offered a problem after his very heart. During the whole of my narration he sat as motionless as a statue, evidently committing the whole story to memory, detail by detail; and even when I had finished he remained for an appreciable time without moving or speaking.

At length he looked up at me. "This is a very extraordinary affair, Jervis," he said.

"Very," I agreed; "and the question that is agitating me is, what is to be done?"