After long, painful years, Lisbeth Kemmerlang and her sister Johanna were freed by their violent father: master baker Eberhard Kemmerlang went to prison for six years for sexually abusing his daughters. Now Kemmerlang is free and Lisbeth fears her father's revenge. Shortly thereafter, she is found dead in the bakery's automatic oven. Footprints in the flour dust, the unscrewed inner door handle: Lisbeth was murdered. Suspicion falls on the dismissed Kemmerlang. Klara Blum puts his alibi through its paces, especially since daughter Johanna vehemently accuses him. But Kemmerlang, who now works in a large bakery, holds onreview status. Johanna is deeply troubled and seeks support from Klara. But then a plastic bag with the removed door handle is found not far from the crime scene.
Inside is a pair of men's shoes that match the footprints and Kemmerlang's clothes from before. Klara and her new assistant Kai Perlmann arrest Kemmerlang. Klara now has a prime suspect. But something irritates her about the quick fix. The clues appear as if they were specifically prepared. Someone seems to have an interest in incriminating Kemmerlang. Even if Klara doesn't want to admit it at first: There is only one person who can do this. And this is Johanna.