By the author of The Forever War: The classic Worlds trilogy continues as a survivor of a destructive conflict must work to prevent humanity's extinction.

The war that destroyed everything lasted a single day. After an initial nuclear strike, the Earth's population was further devastated by an insidious bioweapon targeting anyone above the age of puberty. Now most of what's left of human civilization gathers on New New York, one of the few orbiting Worlds that remain.

Monitoring the Earth below from the floating habitat, Marianne O'Hara searches for signs of life—and, in particular, for Jeff Hawking, her former lover, who survived the viral nightmare thanks to a biological anomaly that rendered him immune. But Jeff is not the sole surviving adult in this landscape of death, ruin, and feral children, and those who fled to safety underground are being seduced by a terrible new religion preaching blood and vengeance. The last war, it seems, is not over—and the last hope for preventing the final holocaust may be Marianne O'Hara.