Prydale looked at Byner and at his fellow-detectives. Then he turned to the butler. "Come on!" he said brusquely. "Take us there at once!" He glanced at Eldrick. "I'm beginning to see through it, Mr. Eldrick!" he whispered. "This maid's caught Pratt for us. Let's hope he's still----" But before he could say more, and just as the butler opened a door which led into a corridor at the rear of the hall, a sharp crack which was unmistakably that of a revolver, rang through the house, waking equally sharp echoes in the silent room. And at that, Nesta hurried up the stairway to her mother's apartment, and the men, after a hurried glance at each other, ran along the corridor after the butler and the footmen. Pratt came out of his stupor much sooner than Esther Mawson had reckoned on. According to her previous experiments with the particular drug which she had administered to him, he ought to have remained in a profound and an undisturbed slumber until at least five o'clock. But he woke at four--woke suddenly, sharply, only conscious at first of a terrible pain in his head, which kept him groaning and moaning in his chair for a minute or two before he fairly realized where he was and what had happened. As the pain became milder and gave way to a dull throbbing and a general sense of discomfort, he looked round out of aching eyes and saw the bottle of sherry. And so dull were his wits that his only thought at first was that the wine had been far stronger than he had known, and that he had drunk far too much of it, and that it had sent him to sleep--and just then his wandering glance fell on some papers which Esther Mawson had taken from one of his pockets and thrown aside as of no value. He leapt to his feet, trembling and sweating. His hands, shaking as if smitten with a sudden palsy, went to his pockets--he tore off his coat and turned his pockets out, as if touch and feeling were not to be believed, and his eyes must see that there was really nothing there. Then he snatched up the papers on the floor and found nothing but letters, and odd scraps of unimportant memoranda. He stamped his feet on those things, and began to swear and curse, and finally to sob and whine. The shock of his discovery had driven all his stupefaction away by that time, and he knew what had happened. And his whining and sobbing was not that of despair, but the far worse and fiercer sobbing and whining of rage and terrible anger. If the woman who had tricked him had been there he would have torn her limb from limb, and have glutted himself with revenge. But--he was alone. And presently, after moving around his prison more like a wild beast than a human being, his senses having deserted him for a while, he regained some composure, and glanced about him for means of escape. He went to the door and tried it. But the old, substantial oak stood firm and fast--nothing but a crow-bar would break that door. And so he turned to the mullioned window, set in a deep recess.