This book resumes the story of two Manhattan Project scientists after Hiroshima and their quest to render all future nuclear warheads defunct once they have completed twenty years in the stockpile. They succeed but only by engaging with the new Atomic Energy Commission, the Truman Administration, and master spy Klaus Fuchs. Ultimately President Obama must deal with the dilemma of a nation without nukes, while trying to prevent one from going bang in his backyard.