"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—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 learned 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 him, even as his are upon Sir Henry, and with your help he is already almost at my mercy. There is but one danger which can threaten us. It is that he should strike before we are ready to do so. Another day—two at the most—and I have my case complete, but until then guard your charge as closely as ever a fond mother watched her ailing child. Your mission to-day has justified itself, and yet I could almost wish that you had not left his side. Hark!"
A terrible scream—a prolonged yell of horror and anguish— burst out of the silence of the moor. That frightful cry turned the blood to ice in my veins.
"Oh, my God!" I gasped. "What is it? What does it mean?"
Holmes had sprung to his feet, and I saw his dark, athletic outline at the door of the hut, his shoulders stooping, his head thrust forward, his face peering into the darkness.
"Hush!" he whispered. "Hush!"
The cry had been loud on account of its vehemence, but it had pealed out from somewhere far off on the shadowy plain. Now it burst upon our ears, nearer, louder, more urgent than before.
"Where is it?" Holmes whispered; and I knew from the thrill of his voice that he, the man of iron, was shaken to the soul." Where is it, Watson?"
"There, I think." I pointed into the darkness.
"No, there!"
Again the agonised cry swept through the silent night, louder and much nearer than ever. And a new sound mingled with it, a deep, muttered rumble, musical and yet menacing, rising and falling like the low, constant murmur of the sea.
"The hound!" cried Holmes. "Come, Watson, come! Great heavens, if we are too late!"
He had started running swiftly over the moor, and I had followed at his heels. But now from somewhere among the broken ground immediately in front of us there came one last despairing yell, and then a dull, heavy thud. We halted and listened. Not another sound broke the heavy silence of the windless night.
I saw Holmes put his hand to his forehead like a man distracted. He stamped his feet upon the ground.
"He has beaten us, Watson. We are too late."
"No, no, surely not!"
"Fool that I was to hold my hand. And you, Watson, see what comes of abandoning your charge! But, by Heaven, if the worst has happened, we'll avenge him!"
Blindly we ran through the gloom, blundering against boulders, forcing our way through gorse bushes, panting up hills and rushing down slopes, heading always in the direction whence those dreadful sounds had come. At every rise Holmes looked eagerly round him, but the shadows were thick upon the moor, and nothing moved upon its dreary face.
"Can you see anything?"
"Nothing."
"But, hark, what is that?"
A low moan had fallen upon our ears. There it was again upon our left! On that side a ridge of rocks ended in a sheer cliff which overlooked a stone-strewn slope. On its jagged face was spread-eagled some dark, irregular object. As we ran towards it the vague outline hardened into a definite shape.
It was a prostrate man, face downward upon the ground, the head doubled under him at a horrible angle, the shoulders rounded and the body hunched together as if in the act of throwing a somersault. So grotesque was the attitude that I could not for the instant realise that that moan had been the passing of his soul. Not a whisper, not a rustle, rose now from the dark figure over which we stooped.
Holmes laid his hand upon him, and held it up again, with an exclamation of horror. The gleam of the match which he struck shone upon his clotted fingers and upon the ghastly pool which widened slowly from the crushed skull of the victim. And it shone upon something else which turned our hearts sick and faint within us—the body of Sir Henry Baskerville!
There was no chance of either of us forgetting that peculiar ruddy tweed suit—the very one which he had worn on the first morning that we had seen him in Baker Street. We caught the one clear glimpse of it, and then the match flickered and went out, even as the hope had gone out of our souls. Holmes groaned, and his face glimmered white through the darkness.
"The brute! the brute!" I cried with clenched hands. "Oh Holmes, I shall never forgive myself for having left him to his fate."
"I am more to blame than you, Watson. In order to have my case well rounded and complete, I have thrown away the life of my client. It is the greatest blow which has befallen me in my career. But how could I know —how could l know—that he would risk his life alone upon the moor in the face of all my warnings?"
"That we should have heard his screams—my God, those screams! —and yet have been unable to save him! Where is this brute of a hound which drove him to his death? It may be lurking among these rocks at this instant. And Stapleton, where is he? He shall