Karl and Mike Dippon are brothers who couldn't be more different. While Karl fervently maintains his parents' vineyard on the slopes of Stuttgart, Mike has decided to venture into the high-tech industrial world down in the valley, a world in which he has quickly made quite a few enemies. When he dies of all things at his mother's funeral feast from an unexplained fall, Inspector Bienzle quickly finds people who hated Mike or who benefited from his death: Ralf Schaufler z. B., head of a small but excellent supplier company, was mercilessly pressed by Mike, who is responsible for placing orders with the large mechanical engineering group WÜWAG, so that his existence is endangered.
Mike's fierce competitor within the company, Stefan Butz, is also suspect, since he was at the scene of the crime, which he initially concealed. Or is it a family story? Mike's widow, Nadja Jehle-Dippon, is at least very interested in her deceased mother-in-law's will. At Bienzle private, a baby that Hannelore carelessly took care of for a few days completely upsets the household and the peace of the house.