After taking several years off to have children, nurse Clara Horn returns to work and begins to feel the effects of the much tougher daily routine at the clinic - pressure, stress and tension are the order of the day. But she soon realizes that there is much more going on in her clinic: Apparently, one of her colleagues is deliberately killing patients. Clara must overcome not only her own doubts, but also massive resistance among her colleagues in order to convict the perpetrator, Rico Weber.

Four teenage friends - Frank, Spüli, Mücke, and Pommes - try to have their first contact with the opposite gender. Not so easy in the Ruhr region of the 80s. Attempts at dancing and being in a band go wrong, and their parents and teachers can't help with that, so the four teens need to get creative.

A small paper umbrella attracts the attention of Fredo Schulz when chief detectives Milan Filipovic and Lola Karras visit him at the North Sea. A seven-year-old girl has disappeared. Ashley Bols is already the third missing girl. Schulz was unable to rescue the other two. They have still not been found, but Schulz simply knows that they are dead. He also knows who the perpetrator is: Roland Bischoff.

After several strokes of fate ends a rage eruption of the otherwise so quiet power engineering technician Felix Grünler with a criminal complaint for assault. A grateful affair for his sister-in-law Karin, who forges an intrigue to gain the inheritance of her mother-in-law. She succeeds in having Felix admitted to psychiatry as incompetent. He is determined not to get into therapy. For doctors, this confirms the picture of the labile patient. But in the other patients Felix gives his consistent anti-attitude in the long run benevolent recognition.

Old Matthiesen isn't really very friendly with his daughter Esther. She has fled to her parents' riding stables with her 105-kilo bundle of joy son David because her boy is in trouble with the police again. To her and, above all, Matthiesen's surprise, her sisters Rahel and Thirza also flutter back into the nest: they all bring problems with them - and yet they want to help dad pay off his "latrinous" farm...

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.

In this prequel to the TV series, the individual fates of the members of the later "Red Bracelets" and how they came together are told.

16-year old Steffi just graduated from high school and is very much looking forward to her class trip to Paris where she has promised her boyfriend Fabian the romantic night that she has kept him waiting for so long. Her lifelong plan to join the police forces is already set up, her adult life is right around the corner. At a routine health check-up, just before the trip to Paris, Steffi and her parents are faced with a shattering diagnosis ...