Rosa Wilder is back in Oberwies with her son Tim. She has left the police force and is looking after her father, who is ill. That is until village police officer Betschart suffers what looks like a fatal accident. It quickly transpires, however, that he was beaten to death beforehand. After some initial reticence, Rosa agrees to help in the investigation. Particularly because it is being led by K&..

Recently retired village police officer, Res finds the murdered man's cap in the home of his nephew Elias and informs his colleagues. Elias’ mother Charlotte, Res' sister, will not accept that her son had anything to do with the murder: he couldn't hurt a fly! But when Rosa Wilder tries to question Elias, he flips out and runs off. If Elias is innocent, why is he behaving like th..

Ganove Strunz is not taking it easy on the Räbers. Encouraged by Liechti, the bookkeeper, Strunz tries to bribe the construction company a second time. If the Räbers do not pay the bribe, Strunz will make the documents detailing the price fixing public. But he has hit a brick wall with Dani, who claims that the documents are worthless. Will Strunz fall for this bluff? Dani is coming und..

It's a big day for the Räbers: the dam they have built is being opened. During the speeches, Robert Räber makes an announcement that angers his son, Dani. But a tragic accident suddenly makes it all appear very unimportant. Kägi, meanwhile, is searching for Zingg. He is convinced that Zingg had something to do with the death of his brother-in-law and that the Räbers are al..

Strunz has kidnapped Rosa's son Tim and her father Paul. Strunz holes up with his two hostages in the gravel quarry and demands cash and a getaway car. Because the specialist team doesn't arrive on time, Kägi and Rosa handle it themselves. Kägi negotiates with Strunz, while Rosa sneaks into the gravel quarry to free the captives. Can Rosa Wilder keep a cool head? After all, it is..

With the aid of Res and Rosa, Isabelle searches desperately for her brother Elias who has disappeared. In his secret hideaway, they find the blood-smeared torch of the murdered police officer Betschart. An arrest warrant is issued for Elias; he is now officially a murder suspect. Zingg's son gives Kägi his father's farewell note. It contains incriminating information on Robert R&auml..