"From international bestselling historian Giles Milton comes the remarkable true story of the motley group of allied men and women who worked to manage Stalin's mercurial, explosive approach to diplomacy during four turbulent years of World War II. In the summer of 1941, Hitler did the unthinkable-he invaded the Soviet Union, shattering what Stalin had until then considered an ironclad partnership. It was a shocking, urgent turning point in the war,...