"Where did you get this?" he demanded. "We found it upstairs," said Bob. "Humph," ejaculated the detective and thrust it into his pocket. "Weren't you trailing these Germans too?" inquired Bob. "How do you know they were Germans?" "Who else would want to blow up bridges and ammunition factories?" "Did they intend to do that?" "That's what that list says," exclaimed Hugh, nettled by the questions the man asked as well as by his odd behavior. "Well," said the detective, "you take my advice. This is no place for a couple of boys like you to be hanging around. You might get hurt the first thing you know." He glanced about him nervously as though he expected some one else to arrive upon the scene at any moment. "A man locked us in that room just before you arrived," said Bob. "Then he dashed off in a big gray roadster." "Well, you'd better get out of here yourselves," said the detective shortly. "They may come back at any minute and perhaps you'll need help," protested Bob. "I'll take care of that part of it," exclaimed the detective. "You get out." Convinced that there was nothing else for them to do, Bob and Hugh started off through the woods, leaving the detective in undisputed possession of the premises. They were greatly puzzled by their recent experience. "What do you think of that detective?" demanded Bob, when they had reached a point out of sight of the house. "I think he was an old grouch," exclaimed Hugh. "I don't see why he had to be so disagreeable to us; all we wanted to do was to help him." "Yes, when those Germans come back he's apt to be handled roughly." "He was jealous of us, I believe," said Bob. "Why so?" "Well, we had gone ahead on our own account, and from the way he acted I guess we knew more about what was going on than he did." "Perhaps that's it," said Hugh. "Maybe he was afraid we might take some glory away from him." "How silly!" exclaimed Bob. "What do we want with glory?" "We'd better tell your father what happened this morning." "Of course. He'll think I'm a pretty poor fighter though; a black eye one day and a big lump on my head the next." "How does your head feel anyway?" inquired Hugh. "Oh, pretty well. It still throbs though." "I should think it might, and you can consider yourself pretty lucky that you didn't get your skull cracked open." "He was a queer looking man, wasn't he?" "Yes, and his actions were even queerer." "I guess he was jealous," said Bob. "Oh, well, I don't suppose it makes any difference who corners those Germans, so long as somebody does it." "Personally, I'm sort of glad to get away from that house," said Hugh. "I believe that if we had stayed much longer we never would have left." "How about the detective?" "If he wants to stay that's his lookout, not ours." "That's right, and I suppose he'll go for help anyway."