Kitty rolled over in bed and opened her eyes with a start. What was that? She was sure she had heard someone moving stealthily down the dormitory. The next instant she heard the sound of a smothered giggle and drew a breath of relief. Of course it was only those harum-scarum juniors up to some prank; and by the scuffling noise, thought Kitty, nearly the whole of the dormitory seemed astir. Just as the sounds diminished Kitty heard a bed creak, as if someone had sat up suddenly, and a voice, which she recognized as Duane's, saying: "Who's that? Is there anything the matter?" Kitty gave a little chuckle, then answered softly, "Couldn't say exactly, only I should guess most of the juniors of this dormitory are taking a little nocturnal airing." "Oh, indeed! Well, I'll soon make sure of that." The bed creaked once again as Duane turned out of it. Kitty, now wide awake, and feeling rather amused and curious, slipped quietly out too. The head of the dormitory, looking very tall and striking in a vividly-red dressing-gown, emerged at the same time, a lighted candle in her hand. She crossed to the opposite cubicle and, without ceremony, drew back the curtain. The cubicle was empty. Quickly she made a round of the dormitory; the nine cubicles occupied by juniors were all deserted. The only occupants of the dormitory at that moment were herself, Kitty and Hilary, who could be heard breathing deeply and steadily, soundly asleep. "Shall we follow them, and see what they're up to?" asked Kitty eagerly, only too willing for an adventure. "No fear!" replied Duane with a yawn. "Bed for me. They'll only be gorging themselves in the common-room, I expect. Little wretches! It'll do in the morning. Good night." Yawning again, she went off into her cubicle, carrying the light with her. Kitty hesitated, disappointed, but not caring to switch on one of the lights, and at last decided that, under the circumstances, the most discreet thing to do was to follow Duane's example. In ten minutes, the latter was breathing as regularly and as evenly as Hilary. Kitty, lying awake, heard the delinquents return, and grinned to herself as she thought of their surprise in the morning. The head prefect, for once, evidently intended to exert her authority and enforce discipline.