"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."