Immediately after WWII, the hunt is on to capture the highest-ranking Nazis.

Chapter 1: Most Wanted
The return of the documentary, picking up in the immediate aftermath of the Second World War, when the Allies uncovered the scale of the Holocaust. Preparations began for a trial at Nuremberg, where 22 of the highest-ranking Nazis, including Hermann Goering, were to face charges of war crimes and crimes against humanity. But not all the highest-ranking Nazis had been captured, and the job of tracking them down fell to Allied soldiers.

Chapter 2: The Ratline
After the Nuremberg trial, the most senior ranking Nazis had been executed or imprisoned - but many of the worst criminals were still at large. They included Adolf Eichmann, who arranged the transportation of millions of Europe's Jewish people to death camps, and Nazi secret police chief Klaus Barbie, who became known as "the Butcher of Lyon" because of his reputation for extreme cruelty. This documentary follows the hunt for these two war criminals.

Chapter 3: The Reckoning
The continuing story of the diehards committed to hunt down thousands of Nazi war criminals, some of whom were living in plain sight. One such woman was German Beate Klarsfeld, determined to right the wrongs of her country's dark past and identify Nazis who had gone unpunished - including the notorious Klaus Barbie. The documentary also tells the story of Josef Mengele - who performed gruesome experiemnts on Auschwitz inmates - and the son so appalled by his father's actions he considered turning him in.