It was a wild, hoarse scream, so strange and unnatural that it might have come either from a man or a woman. At the same instant there was a heavy thud, which shook the old house, and then all was silence. The maid stood petrified for a moment, and then, recovering her courage, she ran downstairs. The study door was shut and she opened it. Inside, young Mr. Willoughby Smith was stretched upon the floor. At first she could see no injury, but as she tried to raise him she saw that blood was pouring from the underside of his neck. It was pierced by a very small but very deep wound, which had divided the carotid artery. The instrument with which the injury had been inflicted lay upon the carpet beside him. It was one of those small sealing-wax knives to be found on old-fashioned writing-tables, with an ivory handle and a stiff blade. It was part of the fittings of the professor's own desk.
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