dr Patrick Wangila was stabbed. The first indications point to a relationship act: the doctor from the Congo was married to a German woman, but apparently he was having an affair. Ballauf and Schenk quickly set their sights on his widow Vivien Wangila. But Wangila's clinic colleague Dr. Sabine Schmuck and the nurse Angelika Meyer get caught up in contradictions. In addition, the commissioners are puzzled as to whether there is a connection between this act and the death of a young Congolese woman who recently threw herself out of a window during a police raid on a shelter for refugees. Then Théo Wangila appears on the scene. Like his brother Patrick, he was also recognized as a war refugee a few years ago and has built a new life in Cologne. Now he wants to find out on his own who murdered his brother.