Wrocław 1908: As one of the middle daughters of a large German-Polish family, Erna Eltzner leads a rather inconspicuous life. Everything changes when she faints at the lunch table just a few days after her fifteenth birthday. Not only does she hear voices, but a spirit also appears to her. Mrs. Eltzner is in a state of excitement: Are the mediumistic abilities that she believes her daughter possesses beginning to manifest in Erna, the child she feels closest to? Erna's father, Friedrich Eltzner, is not particularly concerned about his children's affairs. Doctor Löwe visits the sick girl, although he has little interest in the supernatural, and advises sending for an exorcist. The wondrous Walter Frommer, an occultist well-versed in esoteric matters, is consulted. And Joachim Vogel, undoubtedly an expert in his field, who has very modern views on mental illnesses. When Mrs. Eltzner invites guests to séances, a solemn silence fills the apartment. If the daughter makes contact with the souls of the deceased, the widowed Mrs. Schatzmann, who misses her husband, is just as fascinated as her son Arthur, who aspires to be a great physiologist. Is this a gift, or has Erna succumbed to madness, perhaps even hysteria? The fifteen-year-old becomes a phenomenon, the case of E.E.