"Golly," exclaimed Hugh. "There's lots going on around here, isn't there?" "Too much," said Mr. Cook soberly. "I hope that explosion hurt no one." "How about the fire?" asked Bob. Sergeant Riley arrived just then and reported that the fire department had the blaze under control and that it was only a question of a short time before it would be entirely out. "'Tis lucky it is no worse," he said seriously. "And it's also lucky that my insurance will pay for it all," added Mr. Cook. "The thing that makes me mad is that the German divils who exploded the bomb all got away," exclaimed the sergeant bitterly. "Were there more than one of them?" asked Bob. "We don't know for sure," replied Riley. "One o' the men told me he saw two of them running away, but he may have been mistaken." "Well, Hugh and I caught one of them," said Bob. "You did!" almost shrieked Sergeant Riley, bouncing out of his chair. "Where is he then?" "We don't know." "What do yez mean?" "He got away from us, and we lost him in the crowd." "Oh, my boy, my boy," wailed Riley, nearly in tears. "Why did yez ever let such a thing happen to you? That was our chance to put a crimp in the whole gang, and now I suppose they'll be after blowing things up worse than ever." "But we didn't do it on purpose," protested Bob meekly. "I know yez didn't," said the sergeant. "If I had only been there! I can tell yez that if ever I get my hands on one of them fellers he'll never get away." "It's too bad," exclaimed Mr. Cook. "Still I don't think the damage they did here will seriously interfere with our work for the Government." "I hope not," said Sergeant Riley fervently. "I hope yez can make enough ammunition to blow the bloody Germans clean out of France and Belgium and sink every blooming submarine they have on the ocean." "I hope so, too, Riley," said Mr. Cook. "There's no room in a decent world for people who act as the Germans do." "First of all though we've got to fix it so they can't interfere with our factories over here," exclaimed the sergeant. "I wish we could catch this gang." "What happened to Heinrich?" asked Bob. "Did he get away?" "He did not," said Sergeant Riley. "One of my men escorted him to the police station where he'll be waiting until we want him." "He didn't say what was on that sheet of paper, did he?" "Not yet." "Where's Karl?" asked Bob. "He was going to read it for us." "I don't know where Karl is," said Mr. Cook. "He hurried off to look after part of the factory just before the explosion occurred. He's a good soul, Karl. I wish all the German-Americans were as loyal as he is." "Did one of the guards shoot Lena?" Hugh inquired. "No," replied Mr. Cook. "Karl and I asked them all, and not one of them had even seen her. It's a peculiar thing." "I wonder if our friend the fake detective could have done it." "He wasn't the feller you caught, was he?" asked Riley. "No," said Bob. "Our man had whiskers, didn't he, Hugh?" "Yes," said Hugh.