Niklas Frank was just seven years old when his father, Hans Frank, Hitler's legal adviser and Governor General of occupied Poland, was executed at Nuremberg as a Nazi war criminal.

Throughout his life, Niklas has attempted to come to terms with the enormity of the crimes his father committed, and this remarkable book traces how after years of research he uncovered the extent of the horror unleashed by the man who was known as the butcher of Poland.

Niklas joined Sean on the show...

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