At half-past ten, the servants all retired in accordance With Dr. Cairn's orders. From where he stood by the tall mantel-piece, Robert Cairn could watch Myra Duquesne, a dainty picture in her simple evening-gown, where she sat reading in a distant corner, her delicate beauty forming a strong contrast to the background of sombre volumes. Dr. Cairn sat by the big table, smoking, and apparently listening. A strange device which he had adopted every evening for the past week, he had adopted again to-night--there were little white seals, bearing a curious figure, consisting in interlaced triangles, upon the insides of every window in the house, upon the doors, and even upon the fire-grates. Robert Cairn at another time might have thought his father mad, childish, thus to play at wizardry; but he had had experiences which had taught him to recognise that upon such seemingly trivial matters, great issues might turn, that in the strange land over the Border, there were stranger laws--laws which he could but dimly understand. There he acknowledged the superior wisdom of Dr. Cairn; and did not question it. At eleven o'clock a comparative quiet had come upon Half-Moon Street. The sound of the traffic had gradually subsided, until it seemed to him that the house stood, not in the busy West End of London, but isolated, apart from its neighbours; it seemed to him an abode, marked out and separated from the other abodes of man, a house enveloped in an impalpable cloud, a cloud of evil, summoned up and directed by the wizard hand of Antony Ferrara, son of the Witch-Queen. Although Myra pretended to read, and Dr. Cairn, from his fixed expression, might have been supposed to be pre-occupied, in point of fact they were all waiting, with nerves at highest tension, for the opening of the attack. In what form it would come--whether it would be vague moanings and tappings upon the windows, such as they had already experienced, whether it would be a phantasmal storm, a clap of phenomenal thunder--they could not conjecture, if the enemy would attack suddenly, or if his menace would grow, threatening from afar off, and then gradually penetrating into the heart of the garrison. It came, then, suddenly and dramatically. Dropping her book, Myra uttered a piercing scream, and with eyes glaring madly, fell forward on the carpet, unconscious! Robert Cairn leapt to his feet with clenched fists. His father stood up so rapidly as to overset his chair, which fell crashingly upon the floor. Together they turned and looked in the direction in which the girl had been looking. They fixed their eyes upon the drapery of the library window--which was drawn together. The whole window was luminous as though a bright light shone outside, but luminous, as though that light were the light of some unholy fire! Involuntarily they both stepped back, and Robert Cairn clutched his father's arm convulsively.