Now it should suddenly no longer remain their play and leisure center, the self-built and cleverly equipped box castle on the unused land at the edge of the city. But many adults, and especially the enviously rival group of the 'Losers from Beyond,' have miscalculated. The young box citizens skillfully respond to all kinds of attacks with creativity and an unwavering sense of belonging, as well as through parliamentary discussions and votes. In the end, every opponent must admit: The box castle and the community of the boys and girls manifesting within it must not be destroyed.