?I don?t know that you have done anything wrong,? Miss Hepplewhite said. ?But it is possible that you have done something rather dangerous.? William and Susie thought they were just playing a game when they cooked a witch?s brew in the old barn and said a spell over it, but Martha was not so sure. And indeed, the three friends soon learn that they have called up something dark and evil out of the distant past...