Worlds Apart - Joe Haldeman

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.