Tremaine carried with him a lighted lantern. Tom quickly lighted two lamps.

All the lights of glass in three windows of the living room had been smashed, the fragments of glass strewing the floor.

“This is an unghostly trick,” declared Tremaine, wrathily. “This is plain, malicious mischief. Fortunately, I have glass and putty with which we can repair this damage. But I want to tell you all, right now, if you see a ghost, pot it with a bullet if you can. We’ll keep the rifles at hand during the rest of our stay here.”

They went to the rifles, loaded them and waited, after extinguishing the lights. No more sounds or “signs” bothered the watchers. After an hour of watching, Tremaine, who was a good sleeper, began to yawn.

“I’ll tell you what, sir,” proposed Halstead, finally. “Joe and I will remain on guard, on opposite sides of the house. You and Mr. Dixon may as well turn in and get some sleep.”

“All right, then,” agreed the owner. “But see here, you call me in two hours, and Dixon and I will come down for a turn at this business. We’ve got to catch this ’ghost,’ if there’s any chance at all; yet we must all of us have some sleep.”

So the two Motor Boat Club boys, each provided with rifle and box of cartridges, stepped outside to keep the first watch. At some distance apart both patrolled slowly around the house, keeping sharp watch of the shadows under the nearest of the trees that covered most of the landscape. Once in a while the two boys met for consultation in low tones.

“Nothing doing in the ghostly line,” yawned Tom, at last.

“There won’t be,” nodded Joe, “as long as the ghost knows there’s an armed, unafraid guard patrolling.”

“Then what can it all mean?” wondered Halstead. “What object can any human beings have in annoying other human beings in this fashion?”