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Dave reached the hallway he saw, by a dim light that was burning, a form at the lower end, moving toward a back stairs. An instant later the form glided up the stairs toward the third floor of the school building. The form was in white, and Dave knew it must be one of the students in his nightdress.

"Something is going on," he thought. "Wonder if that is Phil or Roger?"

Curious to learn what the midnight prowler was up to, Dave followed the unknown to the third story of the building. He saw the fellow walk to a side hall. Here it was almost dark, for the servants' rooms were in that part of the building. He stopped and listened and heard an odd creaking and a scraping sound. Then he went forward once more.

Turning into the side hall, a gust of cold wind struck him. He knew it came from overhead, and then he remembered that at the end of the side hall was a ladder leading to a scuttle of the roof. The