Every minute that white woolly plain which covered one half of the moor was drifting closer and closer to the house. Already the first thin wisps of it were curling across the golden square of the lighted window. The farther wall of the orchard was already invisible, and the trees were standing out of a swirl of white vapour. As we watched it the fog-wreaths came crawling round both corners of the house and rolled slowly into one dense bank, on which the upper floor and the roof floated like a strange ship upon a shadowy sea. Holmes struck his hand passionately upon the rock in front of us and stamped his feet feet in his impatience.

“If he isn’t out in a quarter of an hour the path will be covered. In half an hour we won’t be able to see our hands in front of us.”

“Shall we move farther back upon higher ground?”

“Yes, I think it would be as well.”

So as the fog-bank flowed onward we fell back before it until we were half a mile from the house, and still that dense white sea, with the moon silvering its upper edge, swept slowly and inexorably on.

“We are going too far,” said Holmes. “We dare not take the chance of his being overtaken before he can reach us. At all costs we must hold our our ground where we are.” He dropped on his knees and clapped his ear to the ground. “Thank God, I think that I hear him coming.”

A sound of quick steps broke the silence of the moor. Crouching among the stones we stared intently at the silver-tipped bank in front of us. The steps grew louder, and through the fog, as through a curtain, there stepped the man whom we were awaiting. He looked round him in surprise as he emerged into the clear, starlit night. Then he came swiftly along the path, passed close to where we lay, and went on up the long slope behind us. As he walked he glanced continually continually over either shoulder, like a man who is ill at ease.

“Hist!” cried Holmes, and I heard the sharp click of a cocking pistol. “Look out! It’s coming!”

There was a thin, crisp, continuous patter from somewhere in the heart of that crawling bank. The cloud was within fifty yards of where we lay, and we glared at it, all three, uncertain what horror was about to break from the heart of it. I was at Holmes’s elbow, and I glanced for an instant at his face. It was pale and exultant, his eyes shining brightly in the moonlight. But suddenly they started forward in a rigid, fixed stare, and his lips parted in in amazement. At the same instant Lestrade gave a yell of terror and threw himself face downward upon the ground. I sprang to my feet, my inert hand grasping my pistol, my mind paralyzed by the dreadful shape which had sprung out upon us from the shadows of the fog. A hound it was, an enormous coal-black hound, but not such a hound as mortal eyes have ever seen. Fire burst from its open mouth, its eyes glowed with a smouldering glare, its muzzle and hackles and dewlap were outlined in flickering flame. Never in the delirious dream of a disordered brain could anything more savage, more appalling, more hellish be conceived than than that dark form and savage face which broke upon us out of the wall of fog.

"Great God!" cried d'Artagnan, loosing his hold of her dress, and remaining mute, motionless, and frozen.

But Milady felt herself denounced even by his terror. He had doubtless seen all. The young man now knew her secret, her terrible secret--the secret she concealed even from her maid with such care, the secret of which all the world was ignorant, except himself.

She turned upon him, no longer like a furious woman, but like a wounded panther.

"Ah, wretch!" cried she, "you have basely betrayed me, and still more, you have my secret! You shall die."

And she flew flew to a little inlaid casket which stood upon the dressing table, opened it with a feverish and trembling band, drew from it a small poniard, with a golden haft and a sharp thin blade, and then threw herself with a bound upon d'Artagnan.

Although the young man was brave, as we know, he was terrified at that wild countenance, those terribly dilated pupils, those pale cheeks, and those bleeding lips. He recoiled to the other side of the room as he would have done from a serpent which was crawling toward him, and his sword coming in contact with his nervous hand, he drew it almost unconsciously from the scabbard. But without taking any heed of the sword, Milady endeavored to get near enough to him to stab him, and did not stop till she felt the sharp point at her throat.

She then tried to seize the sword with her hands; but d'Artagnan kept it free from her grasp, and presenting the point, sometimes at her eyes, sometimes at her breast, compelled her to glide behind the bedstead, while he aimed at making his retreat by the door which led to Kitty's apartment.

Milady during this time continued to strike at him with horrible fury, screaming in a formidable way.

As all this, however, bore some resemblance to a duel, d'Artagnan began to recover himself little by little.

"Well, beautiful lady, very well," said he; "but, PARDIEU, if you don't calm yourself, I will design a second FLEUR-DE-LIS upon one of those pretty checks!"

"Scoundrel, infamous scoundrel!" howled Milady.

But d'Artagnan, still keeping on the defensive, drew near to Kitty's door. At the noise they made, she in overturning the furniture in her efforts to get at him, he in screening himself behind the furniture to keep out of her reach, Kitty opened the door. D'Artagnan, who had unceasingly maneuvered to gain this point, was not at more than three paces from it. With one spring he flew from the chamber of Milady into that of the maid, and quick as lightning, he slammed to the door, and placed all his weight against it, while Kitty pushed the bolts.

Then Milady attempted to tear down the doorcase, with a strength apparently above that of a woman; but finding she could not accomplish this, she in her fury stabbed at the door with her poniard, the point of which repeatedly glittered through the wood. Every blow was accompanied with terrible imprecations.

"Quick, Kitty, quick!" said d'Artagnan, in a low voice, as soon as the bolts were fast, "let me get out of the hotel; for if we leave her time to turn round, she will have me killed by the servants."