A Fire Upon the Deep review

The galaxy in A Fire Upon the Deep is zoned by the speed of thought: near the galactic core, the Slowness, where intelligence itself is limited; farther out, the Unthinking Depths; and further still, the Transcend, where entities of incomprehensible intelligence emerge and occasionally intervene in the affairs of the merely civilized. Humans, living in the Beyond where interstellar travel and AI are possible, have inadvertently released something from the archives of a dead civilization — a Blight, an entity growing rapidly toward Transcendence and consuming everything it encounters. The only potential countermeasure, a weapon cached by the archaeologists who made the discovery, is stranded on a medieval-technology planet at the edge of the Slowness, defended by two human children whose parents were killed in the initial disaster.

The novel alternates between two threads: the children's survival on Tines' World — a planet inhabited by a species whose individuals form group minds out of packs of wolf-like animals — and the galactic-scale crisis unfolding in the Beyond, where a ship and crew race toward the planet with the Blight in pursuit. Vinge sustains both threads with genuine skill. The Tines are among the most original alien species in science fiction: individual entities who are literally their pack, whose intelligence depends on the right number and proximity of members, and whose social structures flow from that biological fact.