Fast forgotten are the Medlevingers, a small, peaceful people who cut off contact with humans about 500 years ago and moved to a land underground. But suddenly, Johannes sees two beings in the backyard, who only reach up to his knees. He can hardly believe his eyes. The two Medlevinger children, Nis and Moa, are very surprised to discover that the human world really exists. They have come up to search for two missing fellow countrymen. When Johannes helps them, he finds himself dealing with kidnappers and gold seekers, unsure of whom he can still trust. In Kirsten Boie's fantastic youth crime novel, two worlds confront each other: humans with their inventiveness, haste, and possessiveness, and the harmony-loving Medlevingers, for whom community spirit, peaceful coexistence, and security are important. What happens when their inhabitants meet? The book of the same name has been published by Friedrich Oetinger Verlag.