Based on the novel by Maria Gripe, this is the story of two children, Klas and Klara, growing up in the poor Swedish countryside of the mid-19th century. Their father Albert is a glass-blower, famous for his beautiful vases, but still unable to earn enough money for his wife Sofia and the children. At a spring fair a distinguished gentleman arrives and buys all of Alberts glassware. After this nothing will be the same again. Klas and Klara are kidnapped and taken to a strange castle...