.

Rhodes.

      “Tell Charlie what you saw the day you got here, Terry,” suggested Jim.

      Terry told his story and Rhodes was very interested. “That certainly is queer,” he commented, when Terry had finished. “It has always been understood here that no one was in the place. What an old man with a plate of food and candle could be doing in there is more than I can see.”

      “I wonder where that signal was going?” mused Don, who had been watching the building intently. “It must have been directed to some point in the woods directly back of us. The message was in reality going right over our heads. Is there any kind of a building in the woods near here, Charlie?”

      “As I remember it, there is an old farmhouse just back of us in the woods,” said Rhodes, after a moment of thought. “I recall seeing it on one or two hikes we took. That signal might easily have been directed to the farmhouse, at least to the upper windows of it. That is the only building anywhere within a radius of five miles.”

      “Then that was the place where the message was received,” declared Jim, with conviction. “Can’t we hike over there now and take a look at the place? Is it very far?”

      Rhodes shook his head. “Not very far. We can get there in fifteen minutes, and we can land from the boat here without being seen, thanks to the overhanging trees. Want to go?”

      The others agreed at once and the boat was pushed to shore, where they got out and tied it firmly. Then, under the leadership of the upper classman, they took their way through the thick trees that grew back of the lake front.

      They walked on for fifteen minutes through the dusk of woods, until, coming to a slight rise in the ground, they came in sight of the farmhouse. It was an old clapboard house, but kept in order nevertheless. The doors were in place and the windows were unbroken. A few unpainted boards of lighter color showed some attempt at repairs had been made. Weeds grew about the back yard in profusion. Standing in the rough yard near the back door was an expensive looking car. The boys halted in the shelter of some large trees to consider, well out of sight of anyone in the house.

      “Look at the upper back windows,” directed Rhodes. “They are above the level of the tree tops, and from them anyone could plainly catch a signal from Clanhammer Hall. What shall we do, now that we are here?”

      “I don’t see that there is anything to do,” returned Don. “We can’t go up to the place, and we know that it isn’t deserted. Perhaps——”

      Jim grabbed his arm. “Pipe down,” he whispered. “Someone is coming!”

      The back door of the house opened and a man came out. He was tall and thin and was clothed in a dark suit, long light overcoat. He wore a hat pulled down over his eyes. He looked all around as he stepped out of the door and then closed it behind him with a resounding slam. Reaching into his pocket he took out a key and placed it in the lock, turning it and trying the knob. This done he walked to the car, started his engine and rolled out of the yard.

      The boys waited until he was well out of sight and then discussed further plans. Jim was cautious about going to the house but was overruled.

      “It will be all right to go up and look in the windows,” Terry argued. “The man locked the door, and that’s a sure sign that no one is in the place.”

      They approached the house carefully and looked in the back windows. The place was almost bare of furniture, but they did see a table and two old chairs in the kitchen. The rest of the house, at least downstairs, was totally empty. When they had made a tour of the place they gave it up.

      “I doubt if there is anything upstairs,” said Don. “I imagine this man, whoever he is, simply comes here to receive messages from the hall. Perhaps at night they send them by flashlight. It certainly is a puzzler.”

      Rhodes looked at his watch. “Boys, we’ll have to get going. We’ve got just time to make it for supper. I suppose we won’t accomplish anything by standing here wondering, so we may as well beat it.”

      They retraced their steps hastily and rowed across the lake, where they put the boat away and went inside to wash up for supper. After the evening meal the four of them spent some time talking things over. Just before leaving them the senior said:

      “Well, we’ll keep this to ourselves. Whatever is going on may be all right, but I have my doubts. I think there is a mystery right here under our own noses, and let’s hope we can run it down. Suppose we all keep our eyes peeled and see what we can do.”

      CHAPTER 5

      The Man with the Key

      Although the four cadets took care to keep their eyes wide open they saw nothing in the succeeding days to help them solve the mystery which they had run across. At times they discussed the subject and made guesses, but these generally ended in nothing, and there were times when they half believed that they might be making a mountain out of a mole hill. No news had been received as to the whereabouts of their missing colonel, and life at Woodcrest drifted on in the same efficient manner.

      The arrival of a new cadet gave them something else to think about. One rainy day when the cadets were loitering about the halls waiting for the dinner call, a young fellow in his late teens arrived at the front door of Locke Hall. He was very dark, exceedingly well dressed, and carried himself with a swaggering air. He carried a suitcase plastered with foreign labels, and a cigarette drooped carelessly from one corner of his mouth. Gaining the center of the main hall he looked carelessly around. The cadets were standing in groups laughing and talking, and finally he addressed a third-class man.

      “Say, sonny,” called the newcomer. “Where do I find the sign-on-the-dotted-line room?”

      Considering the fact that Bertram, the third class cadet, was at least a year older than the newcomer, the term “sonny” was something out of the way. Talk ceased instantly among the cadets and they turned to look. Mr. Bertram answered with easy courtesy.

      “That is the door down there,” he said.

      The new man nodded easily. “Thanks, kid. Information is appreciated, I assure you. Is the agony man inside?”

      “I beg your pardon?” asked Bertram.

      “Is the clerk or headmaster or whoever officiates in there?”

      “I think you will find someone in there who will take care of you,” returned the upper classman.

      “I hope so. Somebody had better. I usually get what I want, you know.”

      Mr. Bertram didn’t know anything about it and he looked fixedly at the boy. Totally unabashed at the looks cast in his direction the newcomer walked into the office, where an instructor was sitting behind the information desk.

      The instructor looked up as the boy placed his suitcase on the floor. “How do you do?” he said, smiling pleasantly at the visitor. “What can I do for you?”

      “Oh, I don’t know,” said the boy. “Not an awful lot, I guess. My name is Vench, Raoul Vench.” He paused and waited, but Captain Chalmers said nothing.

      “My name is Vench,” repeated the newcomer.

      “Yes, Mr. Vench. Well, what can I do to help you?”

      “Do you mean to say that you didn’t know I was coming?” demanded the new student.

      Chalmers shook his head, his glance keen. “I didn’t know it. Perhaps Major Tireson did. Are you going to register with us?”

      “I certainly am,” answered the boy. “My father sent your headmaster a letter and told him that I was coming. I should have thought he would tell you, so you could be on the lookout for me. Yes, I’m going to be a member of your cadet corps and I’m here to sign up. Pass over the articles and a pen, already dipped in ink, if you don’t mind.”

      Captain Chalmers looked steadily at the boy for an instant and then his gaze wandered to the groups of cadets outside of the door. Suddenly he bit