S20, E24: Dentist Dr. Sibylle Teufel is found bludgeoned with a large tooth model in her office. Detectives Hansen and Kaya quickly identify initial suspects. Amongst these, her colleague Dr. Christian Fromm, who informs them about a phone argument between Sibylle and her husband, Bernd Teufel, shortly before her death. As they dig into Sibylle's professional and personal life, they uncover motives driven by anger, betrayal, and resentment.