Hagen von Strelow is on a flight from South America to Frankfurt am Main. He is a wanted war criminal who is to be put on trial (belatedly) in Germany. Inspector Murot and his assistant Wächter are waiting for him there. Murot had been on his trail 30 years ago, but Hagen von Strelow managed to escape at the last moment. In 1944, von Strelow and Inspector Rother took part in a murder investigation in a small village. A British pilot who was in possession of explosive documents that were crucial to the war was murdered. During the course of the investigation, it turns out that the war-weary investigator Rother is doing everything he can to ensure that the documents do not fall into the hands of the Nazis, and is also protecting the Jew Else Weiß, who is in hiding in the village. With fatal consequences?

Saarbrücken, deep in the night. An explosion shatters the silence. Sleepless Chief Inspector Pia Heinrich is the first on the scene: a security guard was killed in a brutal robbery of an armored car. When Chief Inspectors Leo Hölzer and Adam Schürk arrive, they are presented with a disturbing scene left behind by a massive explosion. What does the number sprayed on the street mean? Does a trail lead to an internationally wanted criminal gang in neighboring France? Chief Inspector Esther Baumann activates her contacts with the French police. Or does the surviving security guard know more than he admits? The team has barely begun their investigation when events take a dramatic turn and Pia is in danger...