When a killer comet hurtles for the earth, 18-year-old Joanna Murphy is selected to wait out the apocalypse in an underground bunker. She enters cryosleep with her close-knit team, preparing to resettle the planet after the atmosphere clears in two hundred years. Joanna is the only one who wakes up. Faced with a bunker full of bones and a blocked exit, Joanna must claw her way to the surface, figure out what happened to her team, and try not to panic—or die. That’s going to be tricky if she’s the only person left in the world. From the author of The Seabound Chronicles, Steel and Fire, and Empire of Talents comes a story of resilience and optimism at the end of the world.

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 the program begins to unravel, Charlotte will have to fight for her place in the future. But the only person who can help her is a hot-headed construction worker with a grudge against her family—and the clock is counting down to disaster.

The apocalypse is over. Armageddon is about to begin. The last survivors of the apocalypse have woken up after two hundred years in cryosleep. The bunker cohorts scattered across the country have different rules, rivalries, and expectations for the future. Joanna Murphy travels to the Oregon bunker, hoping to forge an alliance between the cohorts. But Oregon is on edge after an attack, and they’re in no mood for peace talks. Charlotte Hartland needs to move her cohort to better land, but her people fear the outside world, and they’re questioning her leadership. Joanna’s arrival could undo all Charlotte’s progress. When strangers from a third bunker appear, Joanna and Charlotte must work together to combat a startling new threat. If violence breaks out between the cohorts, it could destroy everything they’ve built.