The Web of Power that keeps the Five Kingdoms safe from evil is under threat. Foyce is determined to destroy it so she can take a terrible revenge on her step-sister, Gracie Gillypot. Meanwhile the five Royal Families are in turmoil. Queen Bluebell is fed up with her tedious grandson, Vincent; Prince Tertius is suffering from the endless nagging of his new wife, Princess Fedora – and on top of everything else there's a big tournament coming up. Things come to a head when Gubble the troll crashes into King Frank's study, and he and Gracie are thrown into a dungeon. A band of fearsome werewolves are gathering in the forests, and Foyce is among them. Will Gracie, Marcus and a handful of bats be able to save the kingdoms from total disaster?