What's wrong with Mom? Fridi can't make sense of it anymore. Her mother is behaving more and more strangely: she sits in the armchair half the night staring into the darkness, prefers to stay in bed rather than have breakfast with Fridi and her father, and sometimes she wanders around all day in her nightgown. When her mother refuses to leave the bedroom at all, Fridi, like Valerie and the others, believes that her mother has gone crazy. But then her father reveals a secret: her mother is a fairy in the human world, a being of darkness who lives in her own world from time to time. At first, Fridi can't believe this either, but gradually she begins to understand her mother's illness. A taboo topic of depression told in a child-friendly way. A comforting book, told with sensitivity. Depression is one of the most common and widespread illnesses.