After a missed call and a disturbing voicemail from his former colleague Hella Christensen, investigator Simon Kessler sets off for Nordholm. The commissioner is aware that something bad must have happened. When Hella's sailing boat is recovered at sea, traces of her blood and her cell phone are found on it, but there is no trace of the former commissioner herself. A SOKO, headed by the new police commissioner Lena Jansen, takes over the investigation. The investigative team not only has to solve Hella's disappearance, but also the death of 15-year-old Viviane, who was found in the woods by her friend Charlotte Broder and probably died of a drug overdose. Kessler realizes how little he knew about the life of his former colleague. After years, Hella's sister Rieke Lehwald suddenly appears with her husband Paul. Do the two have something to do with Hella's disappearance? Is it about an inheritance or a relationship act?

Metin is a young man who has lost his girlfriend and the mother of his baby daughter. A couple of month later at his 30th birthday he struggles more badly than tough everyday life as a single parent.

Police officer Hella Christensen is on her way to her new job in Kiel. But she doesn't get far because a dead girl was found at the pier in her hometown. Hella's new superior, Simon Kessler, has already arrived from Kiel and is awaiting her on the bridge. Hella recognizes the dead person immediately: it is 14-year-old Jenni, daughter of her neighboring family. Kessler orders the recently defunct local office to be used to investigate the murder.

Da kommt Kalle is a German television series.

The SOKO Köln investigates the cathedral city with humor and often with hard work. Their cases take them into a variety of environments, from the Cologne clique to the terraced housing estates on the outskirts of the city.