Belinda, a 16-year-old girl, has disappeared. The last eyewitnesses reported seeing them in the moor that afternoon. But since then there has been no trace of her. Did the girl run away or is this a crime? Borowski's research led him to the girls' boarding school in Hainfeld, where Belinda went. Together with Frieda Jung, he has to realize how lonely and little liked Belinda was. So murder? Borowski still has no idea how close he is to the murderer who is looking for his friendship.