Six weeks ago, former US Marine Patrick Larkin purchased shares in a massive high-tech, state-of-the-art underground missile silo for his family. It was a decision based on easing his wildest, most unimaginable nuclear fears. But then reality strikes with devastating suddenness, razing cities in a searing flash across the nation, all of it witnessed by terrified Americans on TV and the Internet. No one knows who pulled the trigger. No one knows if...