Corpus Christi. On this holiday in June, the last hour strikes for two old wealthy brothers. After an outing to the green heights of the Black Forest, the former construction magnates die as they lived: together. In their historic building in the eastern part of Karlsruhe, a cruel death befalls them after enjoying a bottle of red wine. The team led by Commissioner Oskar Lindt initially faces a mystery. It is only when the former employees of the two brothers—all of Italian descent—come under scrutiny that the case begins to progress.