New police station: Hannes finds it hard to adapt. A once hidden pacifier reopens the cold case of the disappeared 4-year old Maja. Now 18 and instead of a talented pianist became a junky. Iron Cross is stolen from elder Mr. Gundermann.

Ill Gudrun wants to pass on outside the hospital but daughter Verena blocks that. Raids on illegal poker rounds. Lena steals loot from armed Dieter. Daniel practices a poker face. Mobbing and prank videos in front of a döner stand.

A pickpocket saves Harry's child from a car collision. She discovers he desperately needs money for lifesaving surgery on his little sister. The driver drove further. Küppers hides for her colleagues that her wallet has been stolen.

Burglar in the house of Marie who hides her date with Marc. Is there a link between Marc and the burglar? Unknown jogging man fell in coma 4 months ago. Piet's family moved to Bavaria; he misses them. Onna deals in baby milk powder.

Nina goes undercover to get data about medicine swindle; partner Jelena plays a dubious role. Paddy is locked in a safe to get more contact with his father. Hannes discovers that the restaurant of his choice has a case of food poisoning.

The officers from the big city police station are investigating a real "madhouse". The majority of its residents are rather unusual. Therese Tramkvinn, an unsuccessful actress, beats her ex Fynn. Daughter Yelena sees no other way out than to call the police for help. The mother's new boyfriend, the petty criminal "Juanito", has little to offer other than a big mouth. Fynn's mother also gets involved: she calls her son an "idiot" because, as a Buddhist, he puts up with everything because of his karma. In the "madhouse" the threads come together to form a tangle of crimes, intrigues and lies that the investigators from PK 14 are trying to unravel. Meanwhile, Hannes Krabbe is eagerly awaiting police officer Jessy Jahnke at the police station. She will step in for Nina Sieveking, who is recovering from a serious gunshot wound. Jessy's start is not a good one: instead of a welcoming speech, after a few minutes she gets her first lecture from Mrs Küppers.

17-year-old Michelle is a typical teenager: rebellious, insecure, in love. Her escape from everyday life is dancing to hard hip hop, where she can let it all out. Her mother Susanne must not know about it, however. She wants to leave everything behind that has to do with her old, difficult life on Veddel, now that her new husband is a judge and wealthy. When Lukas Petersen and Jessy Jahnke catch Michelle during an attempted robbery, Susanne almost thinks her daughter is lost. Because it was not her first robbery. Only Jessy senses that something or someone else must be behind it. She believes that gangster rapper Faoud is blackmailing the student. Harry Möller and Piet Wellbrook have to take care of a much older problem child: Zacharias "Zappa" Martens used to be a musician, even in a support act for the Beatles. He has a guitar shop in the neighborhood where Piet used to work. Zappa's life is rock 'n' roll - in every way. When he is brought to the police station, drunk and beaten up, the ghosts of the past cause great unrest in Piet's head.

There is a bad atmosphere between the upright Daniel Schirmer and the rebellious Jessy Jahnke - the two simply can't get along. So they only reluctantly follow Hannes Krabbe's well-intentioned idea of patrolling together. While Daniel and Jessy are investigating a noise nuisance, they are observed by Meik. He is a cleaner in an event location where adventure seekers can book "escape rooms". To escape, the trapped visitors have to solve puzzles. But Meik would much rather be a policeman than a cleaner. And so he lures Daniel and Jessy into a trap, steals the patrol car and drives to his first real mission in a fake uniform. He happens to meet the wanted drug dealer "The Snowman". The situation escalates and puts Harry Møller and Piet Wellbrook's lives in danger.

Harry and Piet catch burglars at key expert Hans who lies dead on the floor. Nele has Hans' special key. Urs organizes volleyball events as facade for drugs dealing. The computer of Frau Küppers breaks down.

An SUV parks in the middle of a bridge. A woman sits at the wheel, who, however, does not let Lukas Petersen and Jessy Jahnke move to get out or drive away their car. When the towing service ordered by Lukas arrives, the woman threatens to let a bomb go up. Lukas is not sure whether there is a psychological or explosive problem here. At the same time, a demonstration train against animal experiments moves towards the car. Melanie von Stetten and her boyfriend Frank. He urges his girlfriend to throw in the windows of a hated pharmaceutical company with stones that lies on the protest route. What Melanie doesn't know: she heads directly for a disaster.

The "Katzenauge" club has apparently made a name for itself in the city as a distribution point for dangerous ecstasy pills. Maxim not only deals them, but also takes them himself, like his friend. Suddenly both of them collapse on the dance floor and have to go to the hospital immediately. What Maxim doesn't yet know at this moment is that Jessy Jahnke is investigating him. Lukas Petersen senses that this is not the first time they have met. Jens Salm is supposed to come clean, because "Forellen-Flo" accuses the man from Bremen of breaking into his car at the fish market. And - what is much worse for the famous market crier - of stealing his voice. Harry Möller and Piet Wellbrook still have to get the hoarse brawler to talk. Mrs. Küppers has a saving idea. And it also happens to save Hannes Krabbe from embarrassment: he has to think up a puppet show for the police clown and is suffering from severe writer's block.

Piet Wellbrook and Harry Möller can't believe their eyes when their former colleague Paul Dänning suddenly turns up on a mission in the port of Hamburg. The officers are pursuing two suspected criminals in the container port when the situation takes a terrible turn - Paul Dänning shoots one of the two, critically injuring him. Paul is at his wits' end, but claims to have acted in self-defense. It is not Paul's only problem. He has come back to Hamburg because of his daughter Frauke and her children and is looking after them. Frauke cannot bear the responsibility for her children alone at the moment. The world of Lukas Petersen and Daniel Schirmer is much more colorful. While solving a theft, they stumble upon a LARP event, a live acting role play in which disguised knights, orcs and Princess Sina Cottmann fight each other for control of the realm of the city park.

Something is going alarmingly wrong in Hannes Krabbe's life. Every morning the radio alarm clock wakes him up with the same song, every morning the presenters make the same jokes. The events at the station are also similar to those of the previous day: colleagues Petersen and Jahnke's car has broken down. Mrs Küppers has such a cold that she calls in sick. And Piet Wellbrook chokes on the mineral water. What is going on here? It gets worse. Every day the same, actually harmless rear-end collision happens between the half-brothers Roderick Brüggemann and Guido Schneider, and when the officers record it, one of the people involved is run over because he was inattentive. Hannes Krabbe tries desperately to break the chain of events. Has he perhaps been cursed by the fortune teller Arkadia?

Station manager Mrs. Küppers has a bad feeling when she finds the letter from Dirk Matthies. She hesitates for days to open it, but there is no way around it. His lines confirm what she suspected: life in PK 14 will be different in the future. Jessy Jahnke doesn't know anything about all this yet. After a minor accident, she has to keep her injured leg still and can't go to work. Her boredom doesn't last long, because from her living room window she sees a female murderer in action in the house opposite. Jessy quickly calls in her colleague Lukas Petersen, who doesn't quite share her wild theories - there is no evidence. After several unsuccessful police operations, Jessy sees only one chance to solve the case: she has to take action herself. When Piet Wellbrook finds little Charly in the cell at the station, he is initially confused: How could the girl sneak in unnoticed? He and Harry take on the girl and soon have a bad suspicion. Is Charly neglected at home and is he seeking help from the police?