A large sophisticated telescope complex sits atop a dormant volcano in one of Earth's most remote locations. Some incredibly bright but fiercely independent folks operate it much of the time. They detect, map, and perform threat analysis of near-Earth objects. Shortly after the world narrowly escapes an extinction event, they start collecting pieces of a related cosmic puzzle. When they've connected enough of them, an intriguing and disturbing picture emerges. Yet the most revealing pieces don't reveal themselves until after all life on Earth already has begun marching in lockstep toward possible oblivion.