"Heinrich is so loyal himself that it never occurred to him that any one would be suspicious," thought Bob as he hurried off toward the house, the strange paper clutched tightly in one hand. He arrived to find every one at the dining-table, and consequently he said nothing about the warning, for he did not wish to alarm his mother. She had just heard from Harold; his company had been ordered away from High Ridge that morning for an unknown destination. She was worried enough over that without having another son on her mind. Fortunately the lump on Bob's head was covered by his hair so that it was not noticeable enough to draw attention to it. His black eye already had been explained. Luncheon was hardly over when the telephone summoned Mr. Cook. Sergeant Riley was on the wire inquiring if Mr. Cook and Bob and Hugh could not meet him at headquarters immediately. A few moments later they were in the car and on their way down the street. Bob was at the wheel. Another car was drawn up alongside the curb in front of the police station and in it were four plain-clothes men. Sergeant Riley was there to explain that they planned to go out to the deserted house and search it thoroughly, by force if necessary. He wished the two boys to go along as guides, and he thought probably Mr. Cook would want to accompany them. A short time later they started, Bob leading the way. As they passed Elm Street he glanced curiously at the white stucco house, number twelve eighty two, and wondered what had happened to the German who had attempted to destroy the railroad bridge. Probably he now rested in jail, awaiting trial. Then again it occurred to Bob that possibly he had been shot; the country was at war and offenders of that kind were not dealt lightly with at such a time. They left the city behind and rolled along over the country road. The three occupants of the car were silent for they did not know what might await them at their destination. A squad of soldiers out on a hike passed them. They were hot, dirty and dusty, but their rifles glinted wickedly in the light of the afternoon sun. "They look like business," remarked Mr. Cook. "They certainly do," exclaimed Bob. "I wish I was one of them." "If the war lasts long enough maybe you will be." "The United States can certainly raise a big army." "Indeed it can," his father agreed. "Germany thought they'd have nothing to fear from us, but they'll be sadly fooled. Just think of the money and food and equipment of all kinds we can furnish our allies; those things are just as important as men, and we can send millions of those, too, if they need them." Presently they came to the spot where Bob and Hugh had dismounted from their bicycles that morning. Bob stopped the car and the plain-clothes detectives followed suit. Sergeant Riley took charge. "You lead the way," he said to Bob. "We'll follow wherever you go."