When a driver for a ship chandler gets in trouble with traffic police, a policeman ends up dead. Against the rest of the police force, Borowski is determined that the driver is not the killer. Meanwhile, in order to avoid suspension for chaining up a reluctant murder witness on a brothel roof naked, Borowski meets with psychologist Frieda Jung.

Strike at the Ostendorf shipyard in Kiel: Works council spokesman Bruhns wants to agree to the dismissal of a maximum of 50 men in order to ensure the preservation of the Kiel shipyard. The boss of the shipyard, Felix Ostendorf, tries almost desperately to make it clear to him that that won't be enough. But Bruhns remains firm, because he gains much personal advantage from his control over who is allowed to work. When Commissioner Borowski is called to the shipyard the next morning, Bruhns lies dead on a work raft.

The carefully draped corpse of 16-year-old student and talented pianist Rita Koehler is found on a grand piano in a concert hall, her body apparently embalmed. Could it have been assisted suicide? The body of an old man, also prepared, is then found - Karl Hahnemann, born in 1923. What did Rita and Hahnemann have in common? Both had a talent: Rita in music, Hahnemann a gifted chess player. A third victim makes it inevitably clear to the investigators that they are dealing with a serial offender: when the seven-year-old, highly talented Björn disappears, Borowski, his colleague Alim Zainalow, and police psychologist Frieda Jung urgently need to decode a pattern in order to track down the perpetrator.

On the day that Ulrich Wahl is called at home by his young Cuban lover Teresa, his fears are confirmed. Covered in blood and completely distraught, she begs him for help. There is a dead person in her secret love nest must go. Wahl feels compelled to act, else the fragile construction of his double life would shatter into pieces. The corpse that Chief Inspector Klaus Borowski confronts Ulrich Wahl with is not the dead man from his lover's apartment. It is a security guard who was found run over on a construction site by the entrepreneur Wahl. Borowski registers Wahl's cool response to the news. The security guard Bernd Ruda was run over with the car of Thorsten Brück, Teresa's husband. Brück also works for Wahl, but has now disappeared. When Wahl is then blackmailed, he confides in the inspector: someone blames him for the death of the security guard and is blackmailing him with it. But why is Wahl telling the commissioner about it?

A new case confronts Commissioner Borowski with grisly finds. In Kiel, the remains of human bodies appear in the sewers - teeth, hair, hip joints. They come from several bodies, and show clear traces of acid. Inspector Borowski and his colleagues are puzzled: where did the remains come from, how did they end up in the sewers, and how many people did they belong to?

What inspector Borowski hears and sees at the crime scene this time also exceeds his imagination: the pregnant Stefanie Brückner had her baby cut out of her body shortly before she was born. The mother is in mortal danger, there is no trace of the child. Frieda Jung surprises Borowski with the assumption that it is very likely a woman who cannot have children of her own, socially isolated and unmarried. A clever analysis, but Frieda Jung is wrong about one important detail.

Commissioner Borowski is on his way home from a fishing holiday when he is called for help at an unusual point: in the middle of the sea, on the way from Sweden to Germany, the captain of the ferry has disappeared without a trace. Borowski had seen him shortly before, when Captain Venske had been arguing with his First Officer Björndahl at the bar. Borowski has all the passengers on the ferry screened and reconstructs the captain's last hours. Even the first trace is strange: someone has opened the pilot door - the signal for an emergency. Did Captain Venske leave voluntarily, was it suicide, accident or murder?

Silke Rohwedder's empty sailing boat is found on the open sea. Her jacket, shoes and handbag on board, there are no signs of her.

The city of Kiel goes on lockdown after a sniper shoots a man on the Hörn Bridge.

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Borowski goes undercover, placing a personal ad to bait a killer who seems to find victims through a lonely hearts site.

It's a tough case for Borowski: The body of the eight-year-old girl has hematomas and a broken rib - both older injuries. The inspector takes a closer look at the family: Michelle's parents, Nadine and Thies Nowak, have financial problems and are struggling with enormous marital problems. To make matters worse, Nadine is pregnant, and then Thies' ex-girlfriend reappears on the scene.

Margret Saloschnik, in her mid-fifties, is found dead in front of a hotel in Kiel. Everything indicates that she threw herself off the roof of the hotel. Klaus Borowski and police psychologist Frieda Jung soon find suspects who all had a relationship with Margret.

Borowski finds himself in the backwoods of Finland searching for a young man who escaped custody during extradition.

When a 15-year-old boy dies after imbibing an energy drink, Borowski suspects a worker from the manufacturing plant.

Parts of a man's body are found in an animal trap at the scene of the crime at a country estate near Kiel. This man was a member of a hunting party and everything indicates that militant animal rights activists are behind the murder. But Borowski soon finds out that even the hunting party there seems to have something to hide. This estate was deliberately chosen by the hunting party. Bears have been bought and now the aim is to illegally hunt bears here undisturbed.

Borowski's last case led to the transfer of his colleague Sarah Brandt. In order to escape the anger in the commissariat, Borowski plunges into a case that leads him into the vast landscape of the North Frisian Wadden Sea. On Suunholt, a small, sleepy North Sea island near Denmark, a man was found dead who is no stranger in Kiel. Years ago Oliver Teuber was the key figure in a corruption scandal. The dead man had apparently found a new life and a new love far from Kiel. On Suunholt, the commissioner faces the completely disbanded Famke Oejen, who found her lover lifeless in her shared bathroom. Borowski is captivated by the mysterious atmosphere of the strange islanders.