A Fire Upon the Deep
Vernor Vinge
The galaxy is divided into Zones, different laws of nature applying in each. The long-forgotten Earth is in one where intelligences are tightly constrained, nanotechnology breaks down rapidly, and nothing can travel faster than light. Further out, FTL travel becomes possible, and ultimately, in the Transcend, godlike Powers live, post-singularity beings as comprehensible to us as we are to goldfish. One day, a foolhardy expedition into the Transcend awakens the Blight: a long-dormant Power, actively evil and mighty enough to drive all before it. Yet all hope is not lost: the expedition’s last survivors crashland a ship with the countermeasure far away, upon a world populated by doglike creatures with pack minds and medieval technology. Now not one, but two races are on. Two factions on that planet, each the beneficiary of technology from the wrecked starship, each asisted by a child survivor of the crash, engage in a war that will determine the destiny of their world; meanwhile, a rescue team speeds to the planet, one step ahead of the Blight’s agents.