Jimmy never thought he'd be spending the apocalypse farming in Nebraska and worrying about Hunter. But when the plague killed their parents, along with everyone over the age of seventeen, Jimmy suddenly became head of the household.

Then the oldest kid in town turned eighteen and the plague chased him down. Now Jimmy has one more thing to worry about—and he's running out of time.

Hunter finds a little girl named Catherine under a cottonwood tree in the middle of nowhere. When Catherine magically heals Hunter's broken arm, Jimmy hopes he will survive his eighteenth birthday if he can protect her from the horseman responsible for unleashing the plague.