There is only one scenario other than an asteroid strike that could end the world as we know it in a matter of hours: nuclear war. And one of the triggers for that war would be a nuclear missile inbound toward the United States. Every generation, a journalist has looked deep into the heart of the nuclear military establishment: the technologies, the safeguards, the plans, and the risks. These projects are vital to how we understand the world we really live in: where one nuclear missile begets one in return; where the choreography of the world's end requires massive decisions made on seconds-notice, with information that is only as good as the intelligence we have. Annie Jacobsen's book explores this scenario, based on dozens of interviews with military and civilian experts who have built the weapons; created the response plans; and been responsible for those decisions should they need to have been made.