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Rh which had been practised upon me, but the warmth of Holmes’s praise drove my anger from my mind. I felt also in my heart that he was right in what he said, and that it was really best for our purpose that I should not have known that he was upon the moor.

“That’s better,” said he, seeing the shadow rise from my face. “And now tell me the result of your visit to Mrs. Laura Lyons—it was not difficult for me to guess that it was to see her that you had gone, for I am already aware that she is the one person in Coombe Tracey who might be of service to us in the matter. In fact, if you had not gone to-day it is exceedingly probable that I should have gone to-morrow.”

The sun had set and dusk was settling over the moor. The air had turned chill, and we withdrew into the hut for warmth. There, sitting together in the twilight, I told Holmes of my conversation with the lady. So interested was he that I had to repeat some of it twice before he was satisfied.

“This is most important,” said he, when I had concluded. “It fills up a gap which I had been unable to bridge, in this most complex affair. You are aware, perhaps, that a close intimacy exists between this lady and the man Stapleton?”

“I did not know of a close intimacy.”

“There can be no doubt about the matter. They meet, they write, there is a complete understanding between them. Now, this puts a very powerful weapon into our hands. If I could only use it to detach his wife——”

“His wife?”

“I am giving you some information now, in return for all that you have given me. The lady who has passed here as Miss Stapleton is in reality his wife.”

“Good heavens, Holmes! Are you sure of what you say? How could he have permitted Sir Henry to fall in love with her?”

“Sir Henry’s falling in love could do no harm to anyone except Sir Henry. He took particular care that Sir Henry did not make love to her, as you have yourself observed. I repeat that the lady is his wife and not his sister.”

“But why this elaborate deception?”

“Because he foresaw that she would be very much more useful to him in the character of a free woman.”

All my unspoken instincts, my vague suspicions, suddenly took shape and centred upon the naturalist. In that impassive, colourless man, with his straw hat and his butterfly-net, I seemed to see something terrible—a creature of infinite patience and craft, with a smiling face and a murderous heart.

“It is he, then, who is our enemy-— [sic]it is he who dogged us in London?”

“So I read the riddle.”

“And the warning—it must have come from her!”

“Exactly.”

The shape of some monstrous villainy, half seen, half guessed, loomed through the darkness which had girt me so long.

“But are you sure of this, Holmes? How do you know that the woman is his wife?”

“Because he so far forgot himself as to tell you a true piece of autobiography upon the occasion when he first met you, and I daresay he has many a time regretted it since. He was once a schoolmaster in the North of England. Now, there is no one more easy to trace than a schoolmaster. There are scholastic agencies by which one may identify any man who has been in the profession. A little investigation showed me that a school had come to grief under atrocious circumstances, and that the man who had owned it—the name was different—had disappeared with his wife. The descriptions agreed. When I warned that the missing man was devoted to entomology the identification was complete.”

The darkness was rising, but much was still hidden by the shadows.

“If this woman is in truth his wife, where does Mrs. Laura Lyons come in?” I asked.

“That is one of the points upon which your own researches have shed a light. Your interview with the lady has cleared the situation very much. I did not know about a projected divorce between herself and her husband. In that case, regarding Stapleton as an unmarried man, she counted no doubt upon becoming his wife.”

“And when she is undeceived?”

“Why, then we may find the lady of service. It must be our first duty to see her—both of us—to-morrow. Don't you think, Watson, that you are away from your charge rather long Your place should be at Baskerville Hall.”

The last red streaks had faded away in the west and night had settled upon the moor. A few faint stars were gleaming in a violet sky,

“One last question, Holmes,” I said, as I rose. “Surely there is no need of secrecy between you and me. What is the meaning of it all? What is he after?”

Holmes’s voice sank as he answered:—

“It is murder, Watson. refined, cold blooded, deliberate murder. Do not ask me for particulars. My nets are closing upon