Thousands of years hence, many races inhabit a universe where a mind's potential is determined by its location in space - from superintelligent entities in the Transcend, to the limited minds of the Unthinking Depths, where only simple creatures and technology can function. Nobody knows what strange force partitioned space into these 'zones of thought', but when the warring Straumli realm use an ancient Transcendent artefact as a weapon, they unwittingly unleash an awesome power that destroys thousands of worlds and enslaves all natural and artificial intelligence.
Fleeing the threat, a family of scientists, including two children, are taken captive by the Tines - an alien race with a harsh medieval culture - and used as pawns in a ruthless power struggle. A rescue party, not entirely composed of humans, must free the children - and retrieve a secret that may save the rest of interstellar civilization.
It has been six years since Vinge's last book ( Marooned in Realtime ), but the wait proves worthwhile in this stimulating tale filled with ideas, action and likable, believable characters, both alien and human. Vinge presents a galaxy divided into Zones--regions where different physical constraints allow very different technological and mental possibilities. Earth remains in the ``Slowness'' zone, where nothing can travel faster than light and minds are fairly limited. The action of the book is in the ``Beyond,'' where translight travel and other marvels exist, and humans are one of many intelligent species. One human colony has been experimenting with ancient technology in order to find a path to the ``Transcend,'' where intelligence and power are so great as to seem godlike. Instead they release the Blight, an evil power, from a billion-year captivity. As the Blight begins to spread, a few humans flee with a secret that might destroy it, but they are stranded in a primitive low-tech world barely in the Beyond. While the Blight destroys whole races and star systems, a team of two humans and two aliens races to rescue the others, pursued by the Blight's agents and other enemies. With uninterrupted pacing, suspense without contrivance, and deftly drawn aliens who can be pleasantly comical without becoming cute, Vinge offers heart-pounding, mind-expanding science fiction at its best.