There was a sigh far away in the darkness--then a groan that seemed to flit about in space, as if seeking to escape the dark, and then died away in a low moan of despair. Before him the blackness seemed to hang like a dark curtain about ten yards in front of him, and in it shone a tiny speck of light no larger than the head of a pin, and which was so bright that he could not look at it steadily. It increased to the size of a pea, and then he discovered that, at times, it would seem miles away in space and then again to draw quite near to hand. Glancing down, he noticed that it cast a bright round spot about an inch in diameter on the floor, and that the spot was slowly revolving in a circle so small that its motion was hardly observable. Surely the mind of a superstitious man was never so punished! When Thorndyke looked steadily at the spot, the black floor seemed to recede, and the spot to sink far down into the empty darkness below like a solitary star; So realistic was this that the Englishman could not keep from fancying that this chair was poised in some way over fathomless space. Presently he noticed that the spot had ceased its circular movement and was slowly--almost as slowly as the movement of the hand of a clock--advancing in a straight line toward him. No such terror had ever before possessed the stout heart of the Englishman. As the uncanny spot, ever growing brighter, advanced toward him, he thought his heart had stopped beating; his brain was in a whirl. After a long while the spot reached his feet and began to climb up his legs. With a shudder and a smothered cry, he tried to draw his feet away, but they were too firmly manacled. “It is searching for my heart,” thought Thorndyke. “My God, when it reaches it, I shall die!” As the strange spot, gleaming like a burning diamond in whose heart leaped a thousand different colored flames, and which seemed possessed of some strange hellish purpose, crossed his thighs and began to climb up his body, the brain of the prisoner seemed on fire. He tried to close his eyes, but, horror of horrors! his eyelids were paralyzed. It was almost over his heart, and Thorndyke was fainting through sheer mental exhaustion when it stopped, began to descend slowly, and, then, with a rapid, wavering motion, it fell to the floor, flashed about in the darkness, and vanished. An hour dragged slowly by. What would happen next? The Englishman felt that his frightful ordeal was not over. To his surprise the darkness began to lighten till he could see dimly the outlines of the chamber. It was bare save for the chair he occupied against a wall, and a couch on the opposite side of the room. The couch held something which looked like a human body covered with a white cloth. He could see where the sheet rounded over the head and rose sharply at the feet.