"I want to come up and see yez," he said. "I've let one of your friends out of jail and I'll bring him along with me if you don't mind." He offered no further explanations, and the three friends were at a loss to understand what his visit could mean and who the "friend" might be. "It must be Karl," said Mr. Cook. "No one can convince me he's disloyal." "I guess that's who it is all right," agreed Bob. They discussed their experiences of the past two days, but no one was able to offer any satisfactory explanation for the strange events through which they had passed. There was only one thing of which they were certain and that was that a band of men who were working for Germany had been plotting against the peace and welfare of the United States. It was not long, however, before Sergeant Riley arrived and every one was greatly astonished to see that his companion was none other than Heinrich. "Yes," said the sergeant. "Here's your friend Heinrich back again, and I guess he's here to stay this time." Mr. Cook was a trifle cool in his greeting to the chauffeur. Not that he did not like him, but he had hoped to see Karl with the police sergeant. He had been convinced of Heinrich's guilt, while he had considered Karl to be innocent. Furthermore Karl had been foreman of the factory for a number of years and had proved himself a most intelligent and valuable workman. "Heinrich has a story to tell you," said Sergeant Riley. "You confessed, did you, Heinrich?" asked Mr. Cook. He was under the impression that he had confessed in order to save himself, and glad as he was to have the mystery and uncertainty ended he did not like a "tell-tale." "He had nothing to confess," said Riley. "Tell your story, Heinrich." "Well," began Heinrich nervously, "in the first place you all suspected me because I worked for Mr. Wernberg. Mr. Wernberg was working all the time for the United States." "What?" exclaimed Mr. Cook in surprise. "Yes," said Heinrich, "that iss what he was doing. He knew there was plots on foot and he knew every one in High Ridge was suspicious of him. He decided to expose those plots and prove that he was a good American. He hired Lena and me mit some others to help him." "Lena, too, was all right?" demanded Bob. "Certainly," exclaimed Heinrich. "Of course she iss all right. Mr. Wernberg he knew who these plotters were, but he was not able to prove anything about them. He also knew that they were meeting in that old house out in the woods. The night before last he went out there in a big gray roadster to search the house." "I didn't know that was his car," said Bob in surprise. "Yes," said Heinrich, "and I was mit him. You and Hugh followed us and we knew it, so to scare you away I took the automobile and brought it home. You see Mr. Wernberg wanted to do it all himself." "We couldn't understand it," muttered Hugh. "To think that you were fooling us all the time, Heinie."