Pulitzer Prize-finalist Stephen Kotkin continues his definitive biography of Stalin, from collectivization and the Great Terror through to the coming of the conflict with Hitler's Germany that is the signal event of modern world history. As the shadows of the 30's deepen, Stalin's drive to militarize Soviet society takes on increasing urgency, and the ambition of Nazi Germany becomes the predominant geopolitical reality he faces when Hitler claims that communism is a global "Judeo-Bolshevik" conspiracy to bring the Slavic race to power. Stalin's paranoia is increasingly one of the most horrible facts of life for his entire country. Stalin's obsessions drive him to violently purge almost a million people, including military leadership, diplomatic corps and intelligence apparatus, to say nothing of a generation of artistic talent. And then came the pact that shocked the world, and demoralized leftists everywhere: Stalin's pact with Hitler in 1939, the carve-up of Poland, and Stalin's utter inability to see Hitler's build-up to the invasion of the USSR. Yet for all that, in just 12 years of total power, Stalin has taken this country from a peasant economy to a formidable modern war machine that rivaled anything else in the world. When the invasion came, Stalin wasn't ready, but his country would prove to be prepared.