Gustav Nissen, a resident of the Olenglück nursing home, is found dead by Nordic walkers in the Legerader Forest in North Frisia. It quickly becomes clear that the man did not die of natural causes. Did the deceased's son, who saw his inheritance threatened by the high costs of the home, have a hand in it? Or is someone in the home providing illegal assisted dying? Commissioner Thamsen pursues several leads, but it is only an undercover operation by his friend Haie in the nursing home that seems to clear the fog...