After Nazi Germany invaded Poland in September 1939, Arthur Greiser became one of the most brutal Nazi officials in annexed western Poland. As Gauleiter and Reich Governor of the Posen region, he oversaw forced Germanization, mass deportations, persecution of the Catholic Church, and the murder of Jews and Poles.

Closely tied to Heinrich Himmler, Greiser helped implement Nazi racial policies and supported the killings connected to the Chełmno extermination camp. This episode follows his rise within the Nazi regime, his role in terrorizing occupied Poland, and how he ultimately paid for his crimes after the Second World War.