Faced with staff shortages, the chief of a Cologne police department convinces two retired homicide detectives to come back into the force. As their immediate superior is a young woman, a generational cultural clash is inevitable.
Anna and her lodger, Mr. Kurtz, have come to terms with each other in their shared flat. But both Mr. Kurtz's planned conversion of the cosy four walls into a smart home and Anna's feelings for a new acquaintance shake up their life together.
