The small room was brilliantly lighted from a large lamp on the central table, which was littered with the doctor’s books and instruments. No one was visible, nor did she see anything unusual, except that in the further shadow thrown by the table a dingy white glove was lying upon the carpet. And then suddenly, as her eyes became more accustomed to the light, a boot emerged from the other end of the shadow, and she realized, with a thrill of horror, that what she had taken to be a glove was the hand of a man, who was prostrate upon the floor. Understanding that something terrible had occurred, she rang at the front door, roused Mrs. Woods, the housekeeper, and the two women made their way into the study, having first dispatched the maidservant to the police-station. At the side of the table, away from the window, Dr. Lana was discovered stretched upon his back and quite dead. It was evident that he had been subjected to violence, for one of his eyes was blackened, and there were marks of bruises about his face and neck. A slight thickening and swelling of his features appeared to suggest that the cause of his death had been strangulation. He was dressed in his usual professional clothes, but wore cloth slippers, the soles of which were perfectly clean. The carpet was marked all over, especially on the side of the door, with traces of dirty boots, which were presumably left by the murderer. It was evident that some one had entered by the surgery door, had killed the doctor, and had then made his escape unseen. That the assailant was a man was certain, from the size of the footprints and from the nature of the injuries. But beyond that point the police found it very difficult to go. There were no signs of robbery, and the doctor’s gold watch was safe in his pocket. He kept a heavy cash-box in the room, and this was discovered to be locked but empty. Mrs. Woods had an impression that a large sum was usually kept there, but the doctor had paid a heavy corn bill in cash only that very day, and it was conjectured that it was to this and not to a robber that the emptiness of the box was due. One thing in the room was missing—but that one thing was suggestive. The portrait of Miss Morton, which had always stood upon the side-table, had been taken from its frame, and carried off. Mrs. Woods had observed it there when she waited upon her employer that evening, and now it was gone. On the other hand, there was picked up from the floor a green eye-patch, which the housekeeper could not remember to have seen before. Such a patch might, however, be in the possession of a doctor, and there was nothing to indicate that it was in any way connected with the crime.