Sons of the Wolf — Barbara Michaels

A heart of darkness unveiled by the light of the moon...

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 two equally mysterious sons, Julian and Francis--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 ...