The brilliant director gives us another thrilling history lesson this week, as he puts his own stamp on some of the key events that shaped the world as we know it. Tonight we're finding out why there was a bit of political upset when Harry S Truman replaced Henry Wallace as Franklin D Roosevelt's vice-presidential candidate in 1944. We'll also be examining the relationships between Roosevelt, Stalin and Churchill, and discovering the part they played in the post-war division of Europe.