They turned into a quiet restaurant and selected a table well to the rear where they could talk without danger of being overheard for there were only a few diners in the place. “Have you seen Condon Adams?” asked Bob. The federal agent shook his head. “I hear he’s having a pretty hard time of it. The chief had him in on the carpet and gave him a going over for letting this fellow slip away from him. But it could have happened to anyone. If we’d gotten there first instead of Adams, we might have been the victims.” They ordered their dinners and Bob leaned across the table. “I’ve been trying to figure out everyone in the office,” he said, “and I can’t find a single one on whom you can pin any suspicion. The leak about that paper must have come from outside before the paper reached us.” “That’s possible,” nodded his uncle. “Remember that another office was rifled before our own was visited,” said Bob. “That should indicate that the marauder had none too clear information on where to look for the paper.” “Now you’ve hit a point I’ve been considering. The more I think about it the more convinced I become that the leak came before the paper reached your filing room. That means our job will be complicated. Maybe we’ll get a break one of these days.” Dinner was served and they ate heartily, ignoring for the time the case that had enfolded both of them in its mysterious tangle. The dinner at an end, Bob leaned back in his chair and shoved his hands in his coat pockets. The fingers of his right hand crinkled a stiff sheet of paper and he drew it out and placed it on the table. It was not an unusual sheet, at first glance, being about eight inches wide and eleven inches long, but it was of heavy material, probably a pure rag paper. But it was not the paper that caught and held Bob’s attention. It was the crest of the War Department which was centered at the top of the page. Merritt Hughes saw Bob staring at the paper and looked at his nephew curiously. “What’s the matter, Bob? Forget to file something this afternoon?” When Bob did not answer at once, he reached over and picked up the paper. It was his turn to stare at the sheet and his eyes widened as he looked up at his nephew. “Great heavens, Bob. Where did this come from?” Bob shook his head. “I haven’t any idea. I put my hands in my pockets just now and the paper was in the right hand pocket.” “But you know what this is?” Bob nodded. “Yes, I know. It’s the missing paper with the radio secrets.” Chapter XX ON A LONELY STREET ★ Uncle and nephew stared at each other across the litter of dishes and for a moment neither was able to speak. “Bob, Bob, how did you get mixed up in this thing? What have you done?” There was anxiety and agony in every word that came from the lips of the federal agent. Bob’s eyes widened. “But surely you don’t think I took this? I couldn’t have done that.”