Holger Nilsson is forced on a raging treasure hunt to find the seven keys to his world-famous relative Mary Diana Graaf's mythical laboratory. To help him, he has the inventor Mortensen and Mary Diana's GPS computer with pre-recorded riddles and clues written in verse. But what kind of mysterious and malevolent figure lurks in the background?
Join us on a breathtaking adventure through the world's different climate zones and its natural types. We meet old and new heroes - Mortensen, Esmé, the young Flora and her grandfather Georg Graaf - who left behind a strange secret. The mystery leads to an ancient map that seems to be related to an ancient myth about the mighty kingdom of Atlantis.