“Did any one of you at any time during the night see or hear anyone around the camp?” Not one sentry had noted anything amiss.

“I can tell you of an experience that happened to us last night, colonel,” spoke up Jim. “We were discussing the whole ghost situation on the Ridge, and our determination to find out who this ghost was, when we heard a noise outside our tent. I might more accurately say that I heard it, and I went outside to see if anyone was there. I didn’t find anyone, but it looks as though someone did sneak up to our tent, hear what we had to say, and then printed this sign to scare us.”

“But in order to do so the party must have gone back to some shelter and spent some time making up the warning, if such it might be called,” mused the headmaster. “I have no doubt, however, that your conversation was overheard. This ghost has developed a bad habit of visiting our camp whenever he feels like it.”

“It wouldn’t have been hard to slip past a sentry in the pouring rain, sir,” suggested Jordan.

“No, not at all,” agreed the colonel. “With this reference to your soldiering, I presume that you young men will have an added cause now to go after this ghost person.”

“That’s a pretty heavy insult!” smiled Major Rhodes.

“Well, the ghost must know now that an active campaign is afoot to drive him off the Ridge,” said the colonel. “That ought to make the game more interesting than ever. Our foe is warned and will play his game with skill. That gives you boys greater odds to move against, but I feel sure that you will be successful in making an end to the affair.”

The regular routine of that day seemed to take longer than usual, but as soon as it was over the members of the Ghost Patrol gathered together to look around in back of the camp for signs of the night visitor. The ground was wet and they argued that if the prowler ever left any traces he would surely have done so that night. Their first search took in the soft soil back of Jim’s tent and they found encouraging signs at once.

“More than one footprint here,” proclaimed Don, grimly, as they bent over the depressions in the dirt.

Someone had sneaked up close to the wall of the tent, and the prints of large shoes were very plain. In the heels of the left shoe they found a peculiarity that gave them something to work on. There had been some kind of a cut down the center of the leather heel and it showed plainly in the soft mud.