Carsten Wiechert is found dead in his apartment. He was thrown into a glass display case and suffered a broken neck. Mick and Andreas quickly discover that Wiechert always came home in the middle of the night, even though the inn where he worked closed its doors much earlier. It soon becomes clear that the respectable inn turns into an illegal casino at night, and the murder victim worked here as a croupier. But who had a motive for the crime?