Ada and Harriet had never met anyone like Mr. Wolfson, the strangely magnetic, darkly funny man who was to be their new guardian. Who, confined to a wheelchair and flanked by two fierce dogs, both welcomed and intimidated the girls. And who had equally mysterious sons, Julian and Frances - one was as good-natured as the other was evil. But evil, as Harriet soon discovered, ran rampant through Abbey Manor and the surrounding moors. Especially in the moonlight...