ARGONAUT BOOKS

Milly and Billy will come into the fullness of their powers, and face down their final challenge. With demons for parents, and supernatural powers of their own, Milly and Billy are now firmly involved in the world of the supernatural. The shadowy forces of their parent's monstrous relatives and rival demons are flourishing, and the twins must survive the nightmares to come from the mysterious band of mortals who wish to control them.