Up and down, and in and out, diving through doorways, racing along passages, chasing one another round corners, groping in cupboards, panting, squealing, laughing or shuddering, the girls pervaded the upper story. There was a ghostly gloom about the old place which made it all the more thrilling, and gave the players a feeling that at any moment some bogy might spring upon them from a dark recess, or a skinny hand be stretched downwards through a trap-door. Flushed, excited, and really a little nervous, both sides at last sought the safety of the "den." Two or three of them began to compare notes. They were joined by others. In a very short time the whole school knew that at least a third of their number had seen a "something." They were quite unanimous in their report. "It" was a girl of about their own age, in a dark-green dress with a wide white collar. Hermie and Ardiune had noticed her most distinctly. She had smiled and beckoned to them, and run along the passage, but when they turned the corner she had disappeared; and Linda and Elsie, whom they had met coming in the opposite direction, declared that they had seen nobody. Lois and Katherine had caught a glimpse of her as they chased Maudie in one of the attics, and Joan declared positively that she had seen her flitting down the stairs. "It's queer in the extreme," murmured Valentine. "Are you quite sure it wasn't really only one of us?" urged Meta. "Absolutely!" declared Hermie emphatically. "We all have on our brown serges to-day, and I tell you this girl was in dark green; not a gym. costume to wear over a blouse, like ours, but a dress with long sleeves and a big white collar." "I don't believe she's a real girl at all," faltered Magsie tremulously. "She's a spook!" Magsie voiced the opinion of the majority. It was what most of the school had been feeling for the last five minutes. The interest in the supernatural, which had been a craze earlier in the term until sternly repressed by Miss Beasley, suddenly revived. Daphne remembered the magazine article she had read entitled "The Borderland of the Spirit World," and cold thrills passed down her spine. Veronica ventured the suggestion that the apparition might be an astral body or an elemental entity. "It's a case for the Society for Psychical Research to investigate," she nodded gravely. "I always said the Grange was bound to be haunted." "What was this girl like?" asked Raymonde reflectively. "Ancient or modern?" "Modern, decidedly. She had on a green dress with a white----" "So you've told us already,"--impatiently. "We know about her clothes. What was she like?" Hermie stood for a moment with eyes shut, as if calling up a mental picture. "About Ardiune's height, but slimmer: rosy face, and dark hair done in a plait--really not so unlike you, Ray, only I should say decidedly prettier." "Thank you!" sniffed Raymonde. "That just about sizes her up!" agreed those who had seen the vision.