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Silence is not difficult for ten-year-old Mona because she has no friends at school. She does not know her father and her mother is a doctor and is often not at home. Fortunately, there is another world - the Red Castle, to which only it has access. 

When Mona finds an injured bird, it is her classmate Julius who helps her care for it. He makes her aware of how important it is to have friends - until a situation arises in which she has to choose between the two worlds ... 

Sarah Knausenberger has made an impressive debut about a girl who manages to find her way out of involuntary isolation. Ulrike Möltgen's wonderfully mysterious illustrations enrich the book with a fascinating, dreamy, magical note.