The Children of Green Knowe

What if my great-grandmother is a witch? thought Tolly. Tolly's great-grandmother wasn't a witch, but both she and her old house, Green Knowe, were full of a very special kind of magic. And Green Knowe turned out not to be the lonely place Tolly had imagined it to be. There were other children living in the house - children who had been happy there centuries before.