When a massive asteroid hurtles toward Earth, humanity braces for annihilation-but the end doesn't come. In fact, it isn't an asteroid but a three-mile-tall alien that drops down, seemingly dead, outside Little Springs, Nebraska. Dubbed "the giant," its arrival transforms the red-state farm town into a top-secret government research site and major metropolitan area, flooded with soldiers, scientists, bureaucrats, spies, criminals, conspiracy theorists-and a murderer.

As the sheriff of Little Springs, David Blunt thought he'd be keeping the peace among the same people he'd known all his life, not breaking up chanting crowds of conspiracy theorists in tiger masks or struggling to control a town hall meeting about the construction of a mosque. As a series of brutal, bizarre murders strikes close to home, Blunt throws himself into the hunt for a killer who seems connected to the Giant. With bodies piling up and tensions in Little Springs mounting, he realizes that in order to find the answers he needs, he must first reconcile his old worldview with the town he now lives in-before it's too late.