When they returned home that evening for supper they did not tell their father what they had learned. But Fenton Hardy himself brought up the question of counterfeit money when he told them that he had that afternoon received a telegram from Federal authorities asking him to further his investigations. "They have evidence that more than ten thousand dollars in counterfeit money was put into circulation within the past three days," he told the boys. "The affair is going beyond all bounds." "And Paul Blum is still silent?" asked Frank. "Can't get a word out of him. I'm inclined to believe he doesn't know anything about the men who are at the head of the organization. I think he was only a tool, employed to get the money in circulation. But I wish you two lads would keep on the lookout for any clues. It will help me a lot if we can run these counterfeiters to earth. Then, besides, there is a big reward." "We'll do our best," they promised. And, secretly, they wondered what Fenton Hardy would think if he knew how much work they had already put on the case and how much evidence they had already gathered, tending to indicate that the old mill on the Willow River was in some way connected with the activities of the counterfeiting gang. "If you can get anything definite in this case," said Fenton Hardy, with a smile, "I'll be ready to admit that you have some abilities as detectives--" "Fenton, don't encourage them," objected Mrs. Hardy. "Nonsense, Laura," he replied. "If they want to be detectives and if they have the talent for it, you might as well try to keep water from running downhill as to stop them. They've done good work on two difficult cases already." "And I have a hunch that we'll do something on this case, too," said Frank, with confidence. CHAPTER XIX THE RUG BUYER Two days later an event occurred that brought the activities of the counterfeiters much closer home. Frank and Joe returned from school on Monday afternoon to find their mother in a state of great agitation. The moment they entered the house they could tell that something unusual had happened, for Mrs. Hardy was sitting by the living-room table gazing disconsolately at a great heap of bills in her lap. "Where'd you get all the money, mother?" asked Frank, jokingly at first. But his expression became serious when he saw the anxiety and distress in Mrs. Hardy's face. Her fingers were trembling as she picked up the bills and put them on the table. "What's the matter?" asked Joe quickly. "What's wrong?" Mrs. Hardy got up and walked across the room toward the window. She looked out at the street for a while, then turned to her sons. "You didn't see a foreign rug buyer around the streets this afternoon, did you?" she asked them. The Hardy boys shook their heads.