A wine shop near Münster is the only clue at first. 25-year-old Luiz Benaso had taken a taxi here the day before his death. Now he was found murdered in an old slaughterhouse. Inspector Frank Thiel and his colleague Nadeshda Krusenstern, who has just been promoted to inspector, take over the investigation. Meanwhile, Professor Karl-Friedrich Boerne has visitors from overseasannounced. His hereditary uncle Gustav von Elst from Florida comes to Münster. When he accidentally found out about Luiz Benaso's murder, he was shocked: apparently he had an affair with the young South American. Does he know who might have had a motive for killing his lover? Apparently Luiz had offered the Schosser wine shop a case of very valuable champagne for sale in Gustav's name -