Ada and Harriet don't know what to expect when they meet their new guardian, Mr. Wolfson. Here is a strangely magnetic, darkly amusing man confined to a wheelchair and flanked by a pair of fierce, dangerous dogs--an enigmatic benefactor, at once welcoming and intimidating. Even more unsettling to the girls are Wolfson's two sons, Julian and Francis. One of them is warm and good-natured, the other is pure malevolence. But young Harriet is about to discover a frightening truth: that evil runs rampant throughout their mysterious new home, Abbey Manor, and the surrounding moors--especially when the moon comes out . . .