They were nine brilliant men who believed in science and who saw before anyone else the awesome workings of an invisible world. They came from many places, some fleeing Nazism in Europe, others quietly slipping out of university teaching jobs, all gathering in secret wartime laboratories to create the world's first atomic bomb. During World War II, few of the atomic scientists questioned the wisdom of their desperate endeavor. But afterward they were forced to deal with the sobering legacy of their creation. Some were haunted by the dead of Hiroshima and Nagasaki and became anti-nuclear weapons activists; others went on to build even deadlier bombs. In explaining their lives and their struggles, Brian VanDeMark superbly illuminates not only their moral reckoning with their horrific creation but also the ways in which each of us grapples with responsibility and unintended consequences.