Binny Cornwallis has lost something. Something that wasn't really hers in the first place. With her best enemy Gareth and her beloved dog Max she turns detective to track it down, but the Cornwallis family are anything but helpful. Little brother James and his friend Dill are having an adventure of their own and big sister Clem is acting very strangely. And on top of all this, Binny suspects their next-door neighbour may be a witch...