Chief Inspector Faber is back on duty, but his job as head of the homicide squad is gone for now. And prosecutor Matuschek wouldn't mind if nothing changed. Faber's colleague Rosa Herzog is now taking over the management on an acting basis. Chief Inspector Jan Pawlak, on the other hand, apparently has little interest in his job. Instead, he prefers to have fun in Alkim Celik's betting shop "Mutluluk" (Turkish for "luck").

When Celik's brother-in-law Lukas Becker is found dead, the "Mutluluk" suddenly becomes the focus of the investigation. An old acquaintance of Faber's is now back on the scene: Tarim Abakay . This time Faber doesn't want to let him get away with it. But his sleuthing doesn't remain without consequences for long: Faber is intercepted by Ira Klasnic and her two armed companions in the parking lot in front of his father's nursing home. Did Abakay send them?

A young woman is arrested in an Asian shop. She is completely beside herself. Her clothes, hands and face are covered in blood. She is holding a knife in one hand. Did she commit murder? And what about the "Chinese dog" that is said to have seen everything?

The Dortmund homicide squad team is initially in the dark. But then the fine gold chain that the young woman is wearing around her neck provides a clue to her identity. A jeweler recognizes the piece of jewelry: he had made the valuable chain several years ago for the Dortmund steel dynasty Haiden family. The suspect is the 25-year-old daughter of the factory owner family. She claims to have killed someone, but can't remember anything. All in all, a murky case with traces from the Ruhr area to China.

Meike Gebken is found dead. She had been living in a women's shelter with her young daughter for four weeks. But what is the motive for the crime? To find out, Rosa Herzog goes undercover in the women's shelter.