Through the 1950s and 1960s, the world witnessed a first in its history: Two global superpowers armed with enough thermonuclear weapons to destroy the planet several times over. While many Americans repeated the idea that nuclear war was too terrible to contemplate, a group of scholars and theorists within the defense and policy worlds thought deeply and carefully about how to wage—and win—such a conflict should it ever erupt. Historian Chris Hamner examines the thinking of scholars like Herman Kahn and those at RAND Corporation as they puzzled out how to deter World War III or, failing that, how the U.S. could emerge victorious—as well as how to understand what everyday Americans were thinking about the monstrous possibility of nuclear war.