When darkness and cold embrace you. It is cold in Bielefeld. Just before the year ends with frost and snow, the body of a young woman is found in a dilapidated farmhouse. Commissioner Dominik Domeyer quickly identifies the deceased after reviewing the current missing persons reports. It turns out to be the sixteen-year-old girlfriend of his youngest son. Could Robin possibly be involved in the murder of the girl? The suspicion that suddenly weighs on his son leads to numerous conflicts within the Domeyer family. The investigator's life spirals completely out of control in this pre-Christmas drama. His wife Betty distances herself from him, his two sons develop suspicion and open hatred towards each other, and work is also far from smooth: Domeyer's new boss seems to have it in for him from the very beginning.