Mrs. Kinney eyed her caller anxiously as they came to a pause in front of the door. His glance widened at her caution, but he nodded briefly. She turned the key in the lock. Next second the two stepped softly into the room. Mrs. Kinney carefully closed and locked the door behind them; and meanwhile the man, peering closely into the shadows of the place, made out a scene of such strangeness that he nearly forgot the woman's injunction. The room was the private study of Dr. William Kinney. In itself, it was not at all out of the ordinary. Shelves of books, cases of surgical and psychological instruments, star charts, maps and astronomical apparatus-these told at once both the man's vocation and avocation. With these contents and rather severe furnishings the room was merely interesting, not remarkable. But its four chairs certainly were. Each of them was occupied by a human being; and as Mrs. Kinney and her caller entered, neither of the four so much as stirred. They were all asleep. In the nearest chair was the doctor himself, half sitting and half reclining; in fact, all four of the sleepers were in attitudes of complete relaxation.