Born of a German father and a Russian mother, Richard Sorge moved in a world of shifting alliances and infinite possibility. In the years leading up to and during the Second World War, he became a fanatical communist – and the Soviet Union's most formidable spy. Combining charm with ruthless manipulation, he infiltrated and influenced the highest echelons of German, Chinese and Japanese society. His intelligence proved pivotal to the Soviet counter-offensive in the Battle of Moscow, which in turn determined the outcome of the war itself. Drawing on a wealth of declassified Soviet archives, this is a major biography of one of the greatest spies who ever lived.