"You won't even leave this room until you've read what that says," exclaimed Mr. Cook, becoming angry and irritated at Heinrich's refusal to do as he said. Bob had seen their chauffeur stubborn before, however, and he knew that if he made up his mind to a thing he was as obstinate as only a German can be. Heinrich merely looked at Mr. Cook sorrowfully. "I'm a policeman you know," said Sergeant Riley sharply. Heinrich ignored the implied threat completely. "Come on, Heinie," urged Bob cajolingly. "Don't be foolish." "I can't read it," said Heinrich again. "You know," said Mr. Cook, "we're suspicious of some things you have done already, Heinrich. Don't make it worse if you can help it." "I can't read it," said Heinrich. Bob knew the chauffeur well enough to know that there was no use in arguing with him further; it would only be a waste of breath and time. "I don't want to turn you over to the police, Heinrich," said Mr. Cook. "That is what I shall do, however, unless you do as I ask." Heinrich turned paler than ever at this, but the words had no other effect on him. "I can't help it," he muttered doggedly. "I can't read it." "Let me see the paper," said Sergeant Riley. Heinrich handed it over. "What's the little alligator doing on it?" queried the sergeant curiously. "Heinrich can tell you," said Mr. Cook. "What does it mean, Heinrich?" The chauffeur made no reply. He looked at the floor dejectedly but offered no remark. Now and again he glanced about him nervously. Just at that moment the door of the office was opened and Karl Hoffmann entered. Heinrich looked at the newcomer, and there was hatred in his very glance. His fists were clenched tightly so that his knuckles showed white. He opened his mouth as if about to speak, and apparently with difficulty checked himself. Karl Hoffmann took in the scene with one glance and was plainly surprised by the gathering. At first he did not recognize Bob and Hugh, who still wore their disguises. Both boys greeted him, however, and laughed at his surprise when he discovered who they were. Karl himself looked pale as though he was working under a high tension; certainly the times were strenuous. He held something in his hand that apparently he wished to give to Mr. Cook. Before he could speak, however, Mr. Cook anticipated him. "Here is a paper, Karl," he said. "It has German written on it and I'd like to have you translate it for us if you will." As Karl took the paper Heinrich started forward as if he would protest. He was pale and his lips were shut tight; his face was the picture of desperation. He looked as if he had reached the limit of his endurance and must speak. For a moment Bob thought he was going to spring at Karl. Heinrich finally got control of himself, however, and relapsed into a sullen calm. Karl took the paper and looked at it carelessly. Suddenly his jaw dropped and he started back aghast. He turned almost as pale as Heinrich had done.