The Swiss writer Johanna Spyri wrote numerous stories, poems, and songs for children and young people. Her character "Heidi" was a great success during Spyri's lifetime and has made her world-famous to this day. In 1892, her novel "Schloss Wildenstein" was published: A tall figure approached slowly across the terrace, so tall that it could not be a human; but it was not a tree either, as it moved very slowly and was indeed coming towards the forest. Did he really see correctly, or was it the moonlight casting just a moving shadow? The mysteries surrounding the spirit of Schloss Wildenstein keep little Kurt and his lively siblings Bruno, Mea, Lippo, and Mäzli on their toes.