She had been boiling over with fury when she escaped from the Blue Dorm, but this wonderful silver world had a calming effect. It was far clearer now than it had been when she came. Then a haze had hovered over the horizon; now the broad line of the Fossdyke Wash glittered a silver glory on the edge of the white world. The great stretch of the Walpole Fen intersected by its wide ditches unrolled itself before her, and in the flatness that curious round tower stood out conspicuously. Joey looked at it with interest; it _was_ curious to see a tower standing all by itself like that. She wondered whether she would be allowed to go and explore it sometime, by herself of course, without the company of any of those hateful Redlands girls. And then she thought how interested Mums would be in hearing of it. And then she thought how much more interested Mums would be if she, Joey, had seen the redoubtable blue light which Gabrielle had mentioned. And then she wondered if she would see it to-night, where she would have an even better view than if she had been allowed a window bed. That was the last clear thought in her mind before she found a sheltered corner, rolled herself tightly in her quilt, and fell asleep with her face buried in the hollow of her arm to get away from the moonlight. She dreamt of the tower, of course, but all her dreams were confused, not clear. She awoke at last to a sense of cold, which had been with her for some time before it roused her. "You little pig Kirsty; you've taken all the clothes," she murmured sleepily; and then, as consciousness came back, she knew that she wasn't in the familiar little bed at Pilot Cottage, where there was just room for Kirsty and herself and no more, but somewhere in a dark outdoor world with no moon left and a fine rain falling. Joey stood up, holding her damp quilt about her. Luckily, her dressing-gown was thick, but even with that she shivered--of course she must go inside to Blue Dorm, which seemed decidedly attractive at that moment; only how in the world was she to find the trap-door in the dark? Joey turned round, trying to make out the geography of the roof, and, as she turned, something blue shone for a moment through the drizzly darkness. She watched the light, forgetting damp and discomfort and the rather forlorn feeling which had seized her. The blue light flashed out three times and then disappeared. Almost at once the stable clock struck two. The blue light had done more than give Joey a thrilling story for Mums: it had shown her how she stood. When she came up through the trap-door, the tower had been on her right. She made straight for the trap-door in the darkness, and landed full upon it; she felt the ring through her bedroom slippers.