Gelsomina's family functions according to very particular rules. First of all, Gelsomina, at twelve years of age, practically runs the family. Her three younger sisters obey her and work under her watchful eye. But the outside world mustn't know anything about their lifestyle, and they should be kept away from it, well-protected in their isolated countryside home. Gelsomina's father, Wolfgang, is a foreigner and Gelsomina is the future queen of this strange and improbable kingdom he has constructed for them. Nothing will be the same at the end of this summer for Gelsomina and her three younger sisters.