The butcher couple Hans and Lisa Pietsch have been married for many years. They are popular and run a small butcher's shop in a part of Bremen. The sun and its moon – this is how the neighbors describe the couple. But since the accidental death of their daughter ten years ago, the happiness of the former dream couple has been crumbling. When the body of Sandra Wiemann – a young neighbor of the Pietschs – is found, everyone initially believes it was suicide. Helen, Inga Lürsen's daughter, is moving into exactly this apartment building and so Inga uses the opportunity to investigate "undercover" - to the displeasure of her colleague Stedefreund, who is in charge of these investigations himself. For Hans and Lisa, the dead woman was "like a daughter", the dead woman also helped the single mother next door, only the caretaker had turned her down.
All the neighbors get more and more entangled in their statements and suddenly Lisa and Hans not only have to face the questions from the police, but also the mistakes of their past.