A killer comet speeds for Earth, big enough to wipe out all life and choke the atmosphere for a century. When the news breaks, soft-spoken freshman Charlotte Hartland gets caught in a flood of panicked students on her college campus-until a black SUV swoops in to extract her. Charlotte's powerful grandfather has saved her a cryosleep berth at the Bunker Reservation Project, a hastily formed effort to save humanity from extinction. When...