The Overton girls slipped into their blouses, after which Grace crawled under the bed and replaced the carpet. This done she opened the window, all this without making a sound likely to attract attention. Elfreda climbed out first, followed by the captain, then Grace herself. The window was lowered and three persons were swallowed up in the darkness of the night, the captain going to the left, the girls to the right. Grace and Elfreda found the carriage and quickly reached headquarters, where Grace delivered her message. General Gordon came in about the time that Captain Boucher arrived, and looked his amazement at finding the Overton girls there. “What’s wrong, Boucher?” he demanded. “Nothing except that our very good friend, Mrs. Gray, has run down the plotters. I haven’t all of the story yet, but I have this evening listened to one of them giving the plans for blowing up the second ammunition dump and sacrificing the town for the sake of smoking the Americans out. This includes a desperate attempt to fire the barracks so that many men must perish. It’s damnable!” Captain Boucher then related briefly all that had occurred that evening. “This man Klein must be arrested immediately. How did you know that we had caught Yat Sen, Mrs. Gray?” he demanded, turning to the demure figure of the Overton girl. “I heard the doctor reporting it over the telephone in the cellar. The telephone evidently leads across the river. He reports every night at about the same time. It was from overhearing him that I was able to warn you about the proposed firing of Barracks Number Two.” “Now that the matter is in my mind, will you tell me why you had your tunic pinned to the wall?” questioned Captain Boucher. “There is a dictaphone behind the wallpaper at that point, with an opening through the paper so small that one never would notice it.” “I thought so. How did you chance to discover it?” “I looked for it.” The two officers exchanged meaning glances. “How did you come to suspect the doctor?” continued the captain. “He was too suave to be genuine. Then, too, I presume my intuition had something to do with it. Little things, expressions on faces, mannerisms, all these things always did make an impression on me.” Grace then went on to relate conversations that she had heard when the doctor was talking at the cellar telephone. “The doctor in his conversation this evening referred to some person as the Babbler. Do you know whom he meant?” “Mrs. Smythe.” “Is it possible?” exclaimed the captain. “I am not at all surprised,” interjected the general. “She must go, even if she succeeds in clearing herself.” Grace hastened to urge that no suspicion be directed at Mrs. Smythe, who, she declared, was a vain woman who had been used by the German spies because they knew how to appeal to her vanity. In this way they obtained information that the supervisor did not realize she was giving.