"Wonder what?" Colonel Fraser asked when the English youth didn't continue. "I wonder if he did get loose by himself?" Freddy said with a frown. "After all, we know that there were two more of them on the roof. Perhaps there were others. Others who sneaked in here and freed the two live ones, and helped cart the dead one away." "No soap on that, I'd say," Dawson said slowly. "I mean, I don't think they'd have lighted out without finishing us off first." "No, I think you're wrong there, Dawson, old chap," Captain Small said with an apologetic side glance at his superior. "I don't think they bothered about you two because they knew the jig was up. I mean, you see, they knew that Farmer had phoned us, and that we were on the way. I fancy that their first thought was to get away from here as soon as possible." "But why take the dead man?" Dave argued. Captain Small shrugged and smiled. "You have me there, old chap," he said. "But no doubt, it was so that we wouldn't be able to obtain positive identification of the beggar." "But how they did it, and where they went, is really the important part," Freddy Farmer said with a frown. Then, looking at Colonel Fraser, he said, "If I may make a suggestion, sir, why not have this whole building searched? There's no telling what you might gather up." "Ahead of you there, Farmer," the senior officer said. "I have men doing that very thing right now. They are going from floor to floor, and checking up on everybody. They'll be up here to report before long, I expect." "Do you mind a direct question, sir?" Dawson suddenly asked him. "Why, no, not at all. Fire away, Dawson." "About this Karl Stoltz, and Paul von Heimmer, sir," Dave said. "Do you know if your department has ever heard of either of them?" The colonel smiled broadly, and nodded. "I've been waiting for that question," he said. "Yes. We know all about Herr Karl Stoltz and Herr Paul von Heimmer. They arrived in England about six months ago. By parachute from a German night reconnaissance plane. But they didn't get very far because we had been informed by one of our own agents in Germany of their coming. They were given a military trial, and shot. Unfortunately, though, we were unable to learn anything of the work they planned to do in England. However, it undoubtedly was to have something to do with the American Air Forces, because they were both dressed as captain pilots when we gathered them in." Colonel Fraser paused, and a slow smile curled his lips. "And you need not ask the next question," he said. "I'll answer it for you now. Stoltz and von Heimmer bore a very startling resemblance to you two. I can quite readily see how Herr Baron and his two henchmen mistook you for them." There was a moment of stunned silence; then Dave burst out laughing and looked at Freddy Farmer.