A Deepness in the Sky

The plot begins with the discovery of an intelligent alien species on a planet orbiting an anomalous star, dubbed OnOff because for 215 of every 250 years it is dormant, releasing almost no detectable energy. During this period, the planet freezes and its fauna go into hibernation. The planet's inhabitants, called "Spiders" by the humans for their resemblance to arachnids, have reached a stage of technological development very similar to that of Earth's humans in the early 20th century, although humans believe that they may once have been capable of space travel. If this is true, then whoever can establish ties with the aliens first could reap unimaginable rewards; humans have made contact with only one other intelligent (but non-technological) alien species in millennia of travel through the stars. Two human groups launch expeditions to the Spider world: the Qeng Ho (pronounced Chung Ho and named after the explorer Zheng He), traders who have developed a common interstellar culture for humanity; and the Emergents, a civilization that literally enslaves selected human minds and has only recently re-emerged from a Dark Age.

The Qeng Ho arrive at the OnOff star shortly before the Emergent fleet, a few years before the sun turns on, at which point the Spider civilization will "wake up" and continue its climb into a technological civilization. A reception held by the Emergents doubles as a vector to infect the Qeng Ho with a timed "mindrot" virus. The Emergents time an ambush to take advantage of the onset of symptoms.

During these events, a concurrent history of the Spider civilization unfolds – mainly through the picaresque, and then increasingly political and technocratic, experiences of a small group of liberal-minded and progressive Spiders. Their struggles against ignorance and obsolescent traditions are coloured with oddly human-like descriptions and nomenclature, prefiguring some major plot revelations towards the end of the story.

Far above, after a close fight, the Emergents subjugate the Qeng Ho; but losses to both sides force them to combine and adopt the so-called "Lurker strategy", monitoring and aiding the Spiders' technological development, waiting until they build up the massive infrastructure and technological base that the visitors need in order to repair their vessels.

The mindrot virus originally manifested itself on the Emergents' home world as a devastating plague, but they subsequently mastered it and learned to use it both as a weapon and as a tool for mental domination. Emergent culture uses mindrot primarily in the form of a variant which technicians can manipulate in order to release neurotoxins to specific parts of the brain. An active MRI-type device triggers changes through dia- and paramagnetic biological molecules. By manipulating the brain in this way, Emergent managers induce obsession with a single idea or specialty, which they call Focus, essentially turning people into brilliant appliances. Many Qeng Ho become Focused against their will, and the Emergents retain the rest of the population under mass surveillance, with only a portion of the crew not in suspended animation. The Qeng Ho trading culture gradually starts to dilute this, by demonstrating to the Emergents certain benefits of tolerated and restricted free trade; the two human cultures merge to some extent over the decades of forced co-operation.

Pham Nuwen, the founder of the Qeng Ho trading culture, is living aboard the fleet under the pseudonym Pham Trinli, posing as an inept and bumbling fleet elder. He subverts the Emergents' own oppressive security systems through a series of high-risk ruses. During his plotting he begins to admire the Emergents' Focus technology, seeing it as the missing link in his lifelong goal to create a true interstellar empire and break the cycle of collapse-and-rebuild that plagues human planetary civilizations.

The plan to wrest fleet control from the Emergents, however, requires the co-operation of Ezr Vinh, a much younger Qeng Ho who, through attrition, has become the Qeng Ho "Fleet Manager". Ezr's position as the unique liaison officer between Qeng Ho and Emergents leads him to despair, and he accepts Pham Nuwen's offer to join a plot against the Emergents as a way to personal redemption as well as to take revenge against the Emergents. However, his understanding of Pham's ambitions for Focus technology leads to a confrontation between them over the future use of Focus by the Qeng Ho. With new knowledge of the effects and victims of Focus, Pham is forced to admit the cost is too high, and the two reach an agreement and continue their plotting.

The critical moment comes when the Emergents attempt to provoke a nuclear war on the Spider home-world in order to seize power. The conspirators subvert the Emergents' systems and put their plans in action, but so do a small group of Spiders who have become aware of the humans and have been working in secret for years to subvert their Focused as well. Together, the two sides successfully defeat the ruling class of the Emergents.

The combined Emergent/Qeng Ho fleet now negotiates with the Spider civilization as a trading partner. Pham announces his plans to free all of the Focused in the entire Emergent civilization, and, if he survives that, to go to the Galactic Center to find the source of the OnOff star and the strange technology remnants that have clearly traveled with it.

Deepness won the 2000 Hugo Award for Best Novel,[3] the 2000 John W. Campbell Memorial Award,[3] the 2000 Prometheus Award[4] and the 2004 Kurd-Laßwitz-Preis for Best Foreign Fiction;[5] as well, it was nominated for the Nebula Award for Best Novel,[6] the 2000 Arthur C. Clarke Award,[3] and the 2000 Locus Award for Best Science Fiction Novel[3]

Nick Gevers called Deepness "one of the best constructed and most absorbing space operas of the decade", and commented that its "shrewd triumph" is that neither optimism nor pessimism defeats the other.[7] John Clute lauded it as "the most extended example of dramatic irony ever published," in that not only do none of the characters ever learn the truth about the universe, neither does anyone who has not read Fire; he did, however, criticize "the odd dozen-page segments given over to hard-SF geekishness about orbits and computers and stuff".[8]

The SF Site's Greg L. Johnson considered the novel to be "deceptively straight-forward",[9] and at Strange Horizons, Amy Harlib praised it as "huge, complex and captivating" and "rich and satisfying and deserving of its award", emphasizing that it is the equal of its predecessor work.[10] Kirkus Reviews described it as a "chilling, spellbinding dramatization of the horrors of slavery and mind control",[11] while Publishers Weekly noted that it would "fully engage" readers' sense of wonder, and correctly predicted that it would be nominated for the Hugo Award.[12]

• 1999, United States of America, Tor Books, ISBN 0-312-85683-0, Pub date March 1999, Hardback
• 2000, United States of America, Tor Books, ISBN 0-8125-3635-5, Pub date January 2000, Paperback

• A Deepness in the Sky title listing at the Internet Speculative Fiction Database
• A Deepness in the Sky at Open Library
• A Deepness in the Sky at Worlds Without End