In the late 1960s, West Germany is a prosperous democracy. Kurt Kiesinger is the chancellor. But a young German woman, Beate Klarsfeld, knows that Kiesinger is a former Nazi, and she decides to tell the world by publicly slapping him in the face as he is about to make a speech at his party's annual conference. Beate is one of a handful of people who more than two decades after the war are determined to bring Nazis to justice for the murder of millions. Many Nazi criminals remain at large, including the notorious Auschwitz camp physician, Josef Mengele.