There was dead silence in the room for five minutes or more; the two men sat so still that they could hear the ticking of the tall old-fashioned clock that stood outside in the hall, and in the mind of one of them the slow monotony of sound woke up a far, far memory. He was looking intently at the small pen-and-ink sketch of the woman's head; it had evidently been drawn with great care, and by a true artist, for the woman's soul looked out of the eyes, and the lips were parted with a strange smile. Clarke gazed still at the face; it brought to his memory one summer evening long ago; he saw again the long lovely valley, the river winding between the hills, the meadows and the cornfields, the dull red sun, and the cold white mist rising from the water. He heard a voice speaking to him across the waves of many years, and saying, 'Clarke, Mary will see the God Pan!' and then he was standing in the grim room beside the doctor, listening to the heavy ticking of the clock, waiting and watching, watching the figure lying on the green chair beneath the lamplight. Mary rose up, and he looked into her eyes, and his heart grew cold within him. 'Who is this woman?' he said at last. His voice was dry and hoarse. 'That is the woman whom Herbert married.' Clarke looked again at the sketch; it was not Mary after all. There certainly was Mary's face, but there was something else, something he had not seen on Mary's features when the white-clad girl entered the laboratory with the doctor, nor at her terrible awakening, nor when she lay grinning on the bed. Whatever it was, the glance that came from those eyes, the smile on the full lips, or the expression of the whole face, Clarke shuddered before it in his inmost soul, and thought, unconsciously, of Dr. Phillips's words, 'the most vivid presentment of evil I have ever seen.' He turned the paper over mechanically in his hand and glanced at the back. 'Good God! Clarke, what is the matter? You are as white as death.' Villiers had started wildly from his chair, as Clarke fell back with a groan, and let the paper drop from his hands. 'I don't feel very well, Villiers, I am subject to these attacks. Pour me out a little wine; thanks, that will do. I shall feel better in a few minutes.' Villiers picked up the fallen sketch and turned it over as Clarke had done. 'You saw that?' he said. 'That's how I identified it as being a portrait of Herbert's wife, or I should say his widow. How do you feel now?' 'Better, thanks, it was only a passing faintness. I don't think I quite catch your meaning. What did you say enabled you to identify the picture?' 'This word--"Helen"--written on the back. Didn't I tell you her name was Helen? Yes; Helen Vaughan.' Clarke groaned; there could be no shadow of doubt. 'Now, don't you agree with me,' said Villiers, 'that in the story I have told you to-night, and in the part this woman plays in it, there are some very strange points?'