For fourteen years, girls between the ages of six and ten have been abducted. Red ribbons tied on trees show the way to their corpses. The police cannot track down the perpetrators for a long time. Finally, one evening he arrests Walter Lesniak, an internationally renowned professor of philosophy and anthropology. He is accused of ten murders of innocent children and the tabloids give him the nickname "Professor Death". His daughter Ann is convinced of her father's innocence and decides to prove it. He goes on a pilgrimage to the darkest corners of the human soul...