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...