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 has meet 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.

A young woman has disappeared without a trace and her boyfriend, a beat cop, is convinced she was murdered.

Two seemingly unrelated cases bring Germany and Sweden together to catch a serial killer. In Kiel, a man jumps into a bathing lake - and is impaled by bamboo sticks. For Borowski and Sarah Brandt, it is initially not clear whether it is the act of a madman who accidentally finds his victims. Or did someone want to punish the dead?

A desperate call alerted the Kiel police emergency number: "He's in my apartment. He just comes through the wall." But for Carmen Kessler, any help comes too late. The young woman is found brutally murdered in her apartment.

The Kiel author Dirk Sauerland is found dead on his yacht. Sauerland was known beyond the borders of Kiel. In recent months he had been working on a spectacular disclosure story.

Jingle bells on the Kiel Fjord: while Commissioner Borowski and his colleague Sarah Brandt are celebrating Julklapp in the Presidium, a murderer is preparing a dark crime in neighboring Schleswig. At the Lucia Festival parade at a Danish school, a man suddenly caught fire. Kriminalrat Schladitz, who spent his childhood in this place, becomes an involuntary witness to the brutal attack. The dead man, Michael Eckart, was the headmaster here and is a member of the Danish minority. At first everything indicates that the murderer can be found in the immediate vicinity of the dead man.

The geriatric nurse Sabrina Dobisch witnesses a traffic accident and bravely tries to save the life of the young pedestrian Christian van Meeren. She then accuses the driver Doris Ackermann of premeditated murder. While Sabrina is celebrated as a courageous rescuer and enjoys public attention, Inspector Borowski remains skeptical: Apart from the testimony, nothing indicates a capital crime. Until his colleague Sarah Brandt finds a gun in Doris Ackermann's glove compartment. Is there a connection between Christian van Meeren and Doris Ackermann? And what role does the piano teacher André Rosenthal play, who often spent time near the dead man?

On a nocturnal boat trip by the company Marex, the lawyer Jens Adam is spectacularly shot. His body disappears into the sea. Marex is a world leader in the mining of raw materials in the deep sea, specializing in rare earths. By mining these metals, which are found in every mobile phone, Marex wants to land a business worth millions. Does Adam's death have anything to do with the killing of an environmentalist who was protesting the destruction of the ocean floor? Jens Adam's wife Marte could also have killed her husband out of jealousy, because he had several affairs.

The severed head of a young man is found in Mundsforde, a small village near Kiel. Before his violent death, 20-year-old Mike was apparently addicted to the drug crystal meth. Inspectors Klaus Borowski and Sarah Brandt investigate the drug scene in Kiel. After a manhunt call, Rita, the girlfriend of the deceased, gets in touch. She tells the inspectors about her love for Mike, a story full of hope for a new life, intoxication and ecstasy. Although recently clean, Rita refuses to cooperate with the police. Rita reminds Borowski of his daughter Carla. He puts pressure on Rita and promises to protect her. In her distress, Rita accuses two dealers - and thereby puts herself in danger.

The 60-year-old alcoholic Onno Steinhaus is found dead in a working-class district of Kiel. Steinhaus had a criminal record for pedophilia and, as Borowski and Brandt quickly find out, lived in complete isolation. Ironically, however, a group of children seemed to have gone in and out of the dead man. Apparently they exploited the dead man's desires, but - as they claim at least - never complied with his wishes. The police officer responsible for the district, Thorsten Rausch, seems to have capitulated in view of the social neglect in his area. Sarah Brandt's investigations bring to light a video that shows a boy - Timo Scholz - in a catchy situation with Onno Steinhaus. Timo denies having been abused. Borowski has to observe that Sarah Brandt is conspicuously often trying to get close to her police colleague Rausch.

A confused woman is found on the Kiel Fjord. Her statements give reason to fear that the notorious murderer of women, Kai Korthals, has reappeared. Inspector Brandt informs her colleague Borowski about the serial killer, with whom she once had traumatic experiences. Borowski finds the new case highly inconvenient. He's in love and wants to get married. But when his bride disappears without a trace, he has to ask himself whether the murderer has returned because of him.

At the heart of the story is a student who accuses her brother of murdering another student. The next morning, Maria's body is actually recovered from the fjord. Investigative duo Klaus Borowski and Sarah Brandt find clues as to why Julia's brother could have committed the crime, but Julia's betrayal cannot be explained by the commissioners. Only when they discover that she has secretly converted to Islam does light seem to be slowly coming into the dark. But Borowski and Brandt are not alone in their research: the state protection department at the state criminal office around head Kesting apparently pursues its own unscrupulous interests.

Hanoverian Commissioner Charlotte Lindholm and Kiel Commissioner Klaus Borowski are confronted with a former elite soldier, who wants to take revenge on his ex-girlfriend after his assignment in Afghanistan before her wedding to a comrade.

Jürgen Sternow, head of the cyber crime department at the Kiel State Criminal Police Office, was the victim of a murder attack. It is reasonable to assume that the perpetrator is to be found in the area of rapidly growing cybercrime. Commissioners Borowski and Brandt are entrusted with the investigation by the responsible public prosecutor. While Borowski first has to acquire special technical knowledge, Sarah Brandt is in her element as a former hacker. But how do you hunt a perpetrator who has no relation to the victim and who knows all the tricks to hide in the Darknet?

There is a state of emergency shortly before the Kiel Week. Three million guests from all over the world are expected to celebrate the largest summer festival in Northern Europe. Now, of all times, a treacherously murdered woman is found in an empty apartment in the middle of the city center. There is no trace of the perpetrator, who had evidently set himself up in hiding for months. When inspector Borowski looks around the victim's apartment, he suddenly finds himself in front of a wall of fire. Roman Eggers and the inspector face each other for a moment. Eggers tries desperately to annihilate the consequences of his crime - and saves Borowski at the last moment. Then he disappears into the anonymity of the city, which is slowly filling up with people. When another body is found, Borowski and Brandt are alarmed: Are they dealing with a serial killer?

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.

A letter from his godchild Grete conjures up the spirits of the past with Commissioner Borowski. Heike Voigt disappeared four years ago. She was a friend's wife. Her husband Frank Voigt was suspected at the time and acquitted for lack of evidence. In the letter, Grete asks her uncle Klaus for help.

Supermarket cashier Peggy Stresemann looks curiously into the window of the neighboring house –. The couple Victoria and Thomas Dell are currently performing a joyful dance. Apparently they have become lottery millionaires! A world breaks down for Peggy: Why are she and her husband Micha never so lucky?! When the neighbors obviously take their time to redeem their profits, Peggy secretly gains access to their house and searches for the lottery ticket. She is surprised by the homeowner. When Commissioner Borowski and his colleague Mila Sahin enter the crime scene a little later, they have a picture like in a gangster film: Thomas Dell is covered in blood on the double bed.

In a coastal forest near Kiel, Commissioners Klaus Borowski and Mila Sahin run eight-year-old Simon out of nowhere. Confused, the boy reports that his grandfather was dead in the forest, that he had been attacked by a dog and protected by an Indian. Borowski hurriedly searches the forest, but finds nothing. Instead, he notices a sailing ship anchored in the bay. When Commissioners bring Simon back to his parents Johann and Nadja Flemming, it is confirmed that Grandfather Heinrich has disappeared. He suffered from Alzheimer's and often just started disoriented.

In the middle of an event at the police college, a young student freaks out and stabs her buddy. He still dies at the scene in the arms of the helpless main commissioner.

The abused body of a young woman is found on a wasteland near a popular Kiel club. The video surveillance of the club will soon provide Klaus Borowski (Axel Milberg) and Mila Sahin (Almila Bagriacik) with a suspect: Mario Lohse (Joseph Bundschuh). The shy-looking outsider regularly watches women's contemptuous videos in the internet forum of the so-called „ Pick-Up Artist “ Hank Massmann (Arnd Klawitter). Since Lohse has no valid alibi, Borowski and Sahin decide to temporarily arrest him.

Alarm in Kiel: In an uprising in the forensic clinic, the woman killer Kai Korthals manages to escape from security custody. Korthals, who crept and killed numerous women in their homes, became Borowski's personal nightmare six years ago when he kidnapped his fiancée Frieda Jung.

A killed infant is found in a parking lot near Kiels. Where's the mother? Did she kill her child? A found entrance volume leads Klaus Borowski and Mila Sahin to the sleepy town of Wacken in Schleswig-Holstein, which wakes up once a year when the world's largest heavy metal festival attracts 80,000 fans. The first trace leads the commissioners to Caterer Michi, who apparently took the young mother with him.

The notoriously unfaithful Tobias Exner has been cheating on his wife Greta, from whose money he lives, for a long time. With his anonymous acquaintance “Kitty13”, whom he met on a dating portal, Tobias plans to murder his wife in order to be rich and free. He already has a plan to make her disappear. But before Tobias Exner can implement his plan, he himself disappears without a trace. All lines of investigation lead Klaus Borowski and Mila Sahin to the mysterious dating contact...