On a rainy, foggy weekend in October, a man suddenly appears in the garden of the Niemann family in Freiburg. He is armed and attempts to break into the house. It is only when the Niemanns alert the police that he disappears. However, the man returns at night and presents a strange ultimatum. Freiburg's chief inspector Louise Bonì and her colleagues are under intense pressure to investigate. There are rumors that the perpetrator is from the Balkans. Bonì's investigations lead her into a dangerous no man's land and to a criminal who seems determined to do anything.