Florian Osswald

Felix'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 once hated and long-since dead Director Hulda Stingbeard. A coincidence causes the former shrunken and skeletonized school principle to rise again, leading to chaos...

Karl and Paula work as specialist divers in Vienna, while their former friend Fred runs a diving school in Croatia. While surveying Vienna's underground, Karl and Paula come across a system of catacombs in which they discover valuable burial objects and a mummified corpse with numerous tattoos. When Karl has an accident during his explorations, Fred is asked for help by Paula. Neither of them suspect what they will soon be involved in.