When Hitler announced that the result of the war in Europe would be "the complete annihilation of the Jews," he did so in 1942, not only in public, but before an enormous crowd in Berlin. The Allies heard, but astonishingly, they did not listen. Why? In 1944, Allied reconnaissance pilots, searching out industrial targets in the area, repeatedly photographed Auschwitz. The pictures, apparently overlooked by the Allies, were routinely filed in government...