Felix Vorndran's school is haunted again, only this time it's not the benevolent spirit of school founder Otto Leonhard and the nuisance he caused, but the hated and long-since dead Director Hulda Stingbeard. An accursed coincidence causes the former shrunken and skeletonized school ghoul to rise again in the school basement. She manages to return to real life, shrinks Dr. Schmitt Gössenwein, and takes over the school to re-impose 19th century education. Felix, Ella and their gang set the levers in motion to save the school again and stumble across a big secret!

While Felix's turbulent adventure to save the school is packed with fast-paced excitement and lots of humor, his emotional challenges lie on the home front. His mother's return from America created a lot of tension between the parents which drives Felix crazy. That they end up getting shrunken through no fault of his own actually comes in handy. This way he has both squabblers in control, and the balance of power in the house of Vorndran shifts – little turns to big, and big turns to little. But when his parents find themselves in real danger and end up in Hulda Stingbeard's claws, Felix realizes how important his parents really are to him.