In "World War II: Behind Closed Doors", award-winning documentary-maker and historian Laurence Rees brings us a gripping new history of World War II - one that is full of surprises, even for those who think they know the history. Drawing on material only available since the opening of archives in the East, Rees re-examines the key decisions made by Stalin, Churchill and Roosevelt during the war. And as the truth about Stalin's earlier friendly relationship with the Nazis is laid bare, a devastating and surprising picture of the Soviet leader emerges - one that is deeply embarrassing for many Russians.The emotional core of the book is the amazing new testimony obtained from nearly a hundred separate witnesses from the period. Former Soviet secret policemen talk frankly for the first time about their repressive work; Allied seamen reveal how they braved the Arctic convoys; and Red Army veterans talk of how they killed Germans in hand-to-hand fighting on the Eastern Front. Accompanying a major six-part BBC2 history series, this enthralling narrative is a mix of high politics - including the inside story of the Allies' meetings at Tehran, Yalta and Potsdam - and the dramatic personal experiences of those on the ground who bore the consequences of their decisions.