Book excerpt: A D-day survivor tells how he later became commander of the just-liberated Buchenwald Concentration Camp, and how that experience set him on a journey of spiritual exploration—in an effort to understand what we can say about God after the Holocaust. Meeting the Russian prisoners at Buchenwald, and learning of Stalin’s similar camps, he decided to make Russia’s problems his own. That decision eventually took him to the Kremlin where he met Gorbachev and Sakharov. Throughout, he describes his discovery of “a down-to-earth spirituality,” one that offers a new approach to reconciling science and religion.