alf-darkness Rudolf felt her turn round on Peter, who was close behind her. "Go back, Peter," she ordered.
"I can't," came a little voice out of the gloom.
"You must--oh, Peter, hurry!"
"I can't go back," said Peter calmly, "because there isn't any back. Put your hand behind me and feel."
It was true. Just how or when it had happened none of them could tell, but the soft drooping bedcovers had suddenly, mysteriously risen and spread into firm white walls behind and on either side, leaving only a narrow passageway open in front. It was nonsense to go on their hands and knees any longer, for even Rudolf, who was tallest, could not touch the arched white roof when he stood up and stretched his arm above his head. He could not see Ann's face clearly, but he could hear her beginning to sniff.
"Now, Ann," said he sternly, though in rather a weak voice, "don't you know what this is? This is an adventure."
"I don't care," sniffed Ann, "I don't want an adventure. I want to go back--back to Aunt Jane!