Former boxing world champion Kai Burdenski is up to his ears in debt and can neither pay rent nor electricity for his boxing school. This is tragic not least because he trains teenagers from youth welfare, for whom his run-down hall has become a home. In particular, the young, talented asylum seeker Samy, who lost her entire family while fleeing Afghanistan, has taken Burdenski under his wing. It doesn't take long for bailiff Billy Kuckuck to understand that the former boxing professional is more than just a coach for Samy and the other young people, namely also a social worker and surrogate father. Therefore, Billy looks for ways and means to help the boxing legend, and turns to his daughter Jessica. But she only saw her father from his worst sides during his sports career and doesn't want to hear anything from him anymore. Burdenski's stubbornness and pride are not helpful here either.

Sauerland, autumn 1995: In the middle of the forest on the Wilzenberg, a walker finds the body of high school graduate Sonja Risse. However, the fact that the killer left a music box with the lullaby "Hush Little Baby" at the crime scene does not lead to a clear solving. 25 years later, the investigative journalist Stefanie Schneider, known as "Mütze", made a surprising discovery in Cologne. In a disused multi-storey car park, she films an undressed corpse of a man with a music box running next to it! When her colleague Jan Römer, who reported on the spectacular Sonja case as a young journalist in 1995, recognizes the melody from back then, he immediately believes there is a connection. He goes to Wilzenberg with his ambitious colleague to interview Sonja's mother Maria, her former teacher Waldheim and her best friends. The more the journalists compile, the clearer the contradictions and gaps that the investigators should have noticed at the time.

Recently, a tragedy deeply shook the siblings Sarah and Kevin. Their parents died in a car accident. Sarah suffers greatly from the loss. She is convinced that her parents were murdered by a creepy woman who haunts their home. Increasingly, Kevin must realize that his sister is in great danger.

Toni and Marc want to divorce, because the great passion seems to be extinguished after 15 years of marriage. It should be a consensual separation, but the new beginning is not so easy: Both have just the chance of a job abroad.

Because the rather gruff debtor Jule Hellwig won't let them into her apartment under any circumstances, Billy Kuckuck doesn't hesitate and confiscates Mrs. Hellwig's car.

Billy Kuckuck is used to taking unpopular measures. But she is not used to switching off her mind in the process. For this reason, the assignment to collect the debt on a personal loan from the family of a recently deceased farmer leaves her anything but cold. The lender is Mr. Röschke, neighbor of the organic farm and also a farmer. His rigorous demand for repayment threatens to drive farmer Tanja Pohlmann to complete ruin. After the death of her husband, who had taken out the loan without consulting her, the mother is already at the end of her tether and no longer able to run the property. Her son Niklas sacrificially takes care of all the daily chores on the farm. In doing so, he neglects school and jeopardizes his A-levels. And nine-year-old Sophie feels obliged to stand in for her mother in the farm store instead of going to school. Of course, Billy is not indifferent to the fate of the organic farm. She is determined to help the Pohlmann family, but where can she start?

Seizing poisonous snakes or rescuing an environmental activist from a threatened tree—Mainz bailiff Billy Kuckuck handles these tasks with enthusiasm and competence. But cases such as the eviction of 80-year-old Margot Kühlborn, who has to move out of her familiar apartment after 50 years due to a personal use lawsuit, do not shake her so easily.

Billy Kuckuck is robbed of her briefcase, which also contains all her money, by a boy at an appointment - who should clearly be at school at this time. It is only by chance that she meets the thieving boy again when she demands the money for a kitchen stove she has sold from her single mother Louisa. It soon becomes clear that Louisa is in a more problematic situation than the unpaid stove initially suggested. The boy is her son and his name is Marcel.

What seems like routine for Billy Kuckuck ends dramatically for her quick-tempered client Karl Löwe: he ends up in hospital with a heart attack. The owner of a traditional pastry shop is alleged to have bought an e-scooter online and not paid for it. He stubbornly insists that he neither ordered nor received the scooter. Billy sees things differently, and this time she wants to follow the rules to the letter.

Organic farmer Tanja Pohlmann is on the brink of financial ruin - can Billy Kuckuck help the family? As "one with a heart", Aglaia Szyszkowitz always sees her job as a bailiff as a challenge and an opportunity to help people in financial difficulties. Even if this means that she sometimes has to interfere in the lives of her current "cases". Fresh from the divorce court, Billy Kuckuck is hired by farmer Röschke to collect a personal loan from Tanja Pohlmann. Her husband, who recently died in an accident, had taken out the loan with Röschke to build the new farm store without her knowledge. The demand for repayment could mean final ruin for Tanja Pohlmann, who is already at the end of her tether and unable to manage the indebted farm.