The Zones of Thought is a science-fiction setting created by Vernor Vinge.In the Zones of Thought verse, the basic gimmick is that the Singularity is spread out sideways. In the Unthinking Depths near the core of the galaxy, no intelligence is possible; in the Slow Zone, where Earth is, Mundane Dogmatic rules apply; the Beyond allows soft SF tropes such as faster than light travel or antigravity, and in the Transcend, everyone is sufficiently advanced. Thus, as you head out of the galaxy, you see the same progression of advancing technologies as you'd expect to see over time if our technology went through a Singularity. In the Slow Zone, Vinge posits that human technological advance reached an apex with the "Age of Failed Dreams", during which it was discovered that faster than light travel, immortality, strong AI, and a few other things are impossible.A Deepness in the Sky takes place in the Slow Zone, next to a very peculiar star. Humanity ignored it for centuries, until possible alien radio signals prompt two nearby cultures to each send a fleet of ships: the Qeng Ho, part of a group of interstellar traders, and the Emergents, an enigmatic civilization that has suddenly raised their technology to high levels.A Fire upon the Deep, which was written first, mostly takes place in the Beyond. A human expedition to the Transcend releases the Blight, a malignant artificial intelligence which has been dormant for five billion years. The only survivors of the expedition are one family, who flee to a backwater world, where both parents are immediately killed and the children sucked into the power struggles of the medieval-level alien natives. Meanwhile, the Blight is rampaging across the galaxy, so a second expedition is sent in search of the children, on the off-chance that their parents might also have found a counter-measure.The Children of the Sky, a sequel to A Fire Upon the Deep, came out in October 2011.
Alternate Number System: The Tines have two different number systems: one where they count "by legs" (in base 4) and one where they count "by fore-claws" (in base 10). Confusion between these two systems leads to the accidental meeting of two of the major characters in A Fire Upon the Deep. Amdiranifani is housed in room 33, Jefri is supposed to be imprisoned in room 15 (33 in base 4), and the guard who's taking him there uses the wrong numbering system.
Apocalypse How: A Fire Upon the Deep features a mind-boggling amount of death and destruction. While most of the good guys survive, and so does the planet on which most of the novel unfolded, an enormous area of High Beyond is converted to Slow Zone. This destroys the Blight, which is dependent on High Beyond technology for its survival. It is also the deathblow for trillions of beings and countless civilizations across a huge swath of the galaxy, whose existences depended on FTL and the same advanced tech as sustained the Blight.
While it was said that trillions were killed in this act, if you look at the visualization of the galaxy and it's zones, the area affected is relatively small in comparison the totality of the Beyond.
Ancient Conspiracy: A Fire Upon the Deep contains an extremely dormant trap setup by the Blight the last time it was active, billions of years ago.
And I Must Scream: What happens to any Skroderider within the Blight's transmission range. The only one that is freed from control, Greenstalk, actually DOES break down screaming after a long period of mute shock and horror.
The characters speculate, that everyone in the regions directly overtaken by the Blight lives like this.
Androcles Lion: In Children of the Sky, what saves Johanna from being torn apart by the Tropicals when she escapes into them. Their hive mind remembers her kind treatment of their singletons, and her work at the Fragmetarium.
Author Tract: A Deepness in the Sky often veers in this direction, particularly whenever there are comparisons between the Emergent civilization and Qeng Ho.
Backup Bluff: Pilgrim Wickwrackscar pulls quite a bold one one on Vendacious, successfully convincing the latter, that his treachery is fully unweiled, and Pilgrim is here to negotiate with him instead of Woodcarver and her soldiers only to prevent him from killing the hostage he had before anyone gets close enough to talk. Except that is all bullshit, no one else is suspecting anything yet, and Pilgrim's actions are based purely on a hunch.
Batman Gambit: A Deepness in the Sky has a rare example of competing protagonistBatman Gambits. Sherkaner Underhill invaded the Focus system and manipulated it to defend against Nau's genocidal plans, while Pham Nuwen used the localizers to invade the system and manipulate it against Nau. They both almost squash each other by accident, buying Nau valuable time when executing his Evil Plan and leading to the probable death of both Sherkaner and his wife.
Big Brother Is Watching: In A Deepness in the Sky, the Emergents take over the Qeng Ho ships, using thousands of dust sized cameras to watch over the Qeng Ho.
That naturally pales before Beyonder surveilance methods, revealed in The Chidren of the Sky - swarms of nanocameras, that infuse the target's bloodstream, can be transferred by a casual touch, and relay everything their host hears and sees. Of course, such technology swiftly decays in the Slow Zone.
A Fire Upon the Deep, as described above at "Apocalypse How".
A Deepness in the Sky, arguably only if you've already read A Fire Upon the Deep.
Children of the Sky isn't quite as dark, but still makes it clear that its characters still have some very dangerous foes and obstacles to face in the near future; there are also some bittersweet partings.
Brain/Computer Interface: Such interfaces are noted in passing in A Fire Upon The Deep. They don't work very well below the High Beyond, but their users still don't like taking them off.
She spends 5 or 6 years aboard a star ship, isolated from her peers with only a low-population skeleton crew for company. Of course, Qiwi and her parents find this a fun learning experience.
Later, the older Lisolet (Qiwi's mom) is killed in rather gruesome (or serene, your mileage may vary) scene.
A work crew is seemingly cooked alive as soon as OnOff enters its 'On' state. Qiwi remarks, "I should have been there."
Not to mention the fact that, every so often, she learns the horrible truth about her situation- particularly the scene where she stumbles upon a recording of Thomas Nau enjoying torturing her mother to death- just to have her mind wiped. Again and again and again.
In A Deepness in the Sky, Pham Nuwen and Tomas Nau.
In A Fire Upon the Deep, Flenser. (Probably The Woodcarver, too; Flenser was her student originally.)
In Children of the Sky, Vendacious reprises his role and pulls a Dragon Ascendant between books to have a go at a bit of the old game.
Chronic Backstabbing Disorder: Just about all significant villains engage in treachery and double-dealing, but the most prominent example is Vendacious. You're kind of a record setter for treason aren't you..., indeed.
The old Flenser once was this, noting, that his previous self could have convinced a fish to swim right into his mouth, but during the story he's no longer able to maintain his facade consistently, thanks to Tyrathect's influence. After his new personality settles in, he manages to convince Vendacious - who is another example of this trope, by the way - into letting him participate in the latter's top secret operation (just to disrupt them), and convinces one of Woodcarver's key underlings to return him the remaining fragment of Steel, while faking his death. That despite old Flenser's Chronic Backstabbing Disorder being well-known to everyone. Good thing that his Heel-Face Turn was genuine.
The Cuckoolander Was Right: In A Fire Upon the Deep, there's a galaxy-spanning Usenet-like network where various aliens discuss the crisis, from a number of different perspectives. One particular alien, "Twirlip of the Mists", is talking through several layers of auto-translation software on an extremely low-bandwidth connection, so most of what it says sounds rather bizarre. It's pretty much all exactly right, though, including such apparent nonsense as "hexapodia is the key insight" since the Skroderiders have six wheels and are in fact the sleeper agents of the Blight that Twirlip was speculating about.
Crazy-Prepared: Pham Nuwen in A Deepness in the Sky. For centuries he has been collecting the most advanced technologies from around the galaxy for his own personal arsenal of tricks. He put secrets into the standard design and equipment of Queng Ho ships that nobody else knows about, and which have layers of innocuous disguises.
In A Fire Upon the Deep it's the total extermination of Sjandra Kei, with Ravna helplessly watch aboard the Oobii.
In A Deepness in the Sky it's the collision and canceling out of Pham Newen's and Sherkaner's Batman Gambits, which results in the destruction of Sherkaner's home, and ultimately (?) Sherkaner himself.
In Children of the Sky it's when Amdi is tossed, member by member, from Vendacious' airship, in full view of Ravna and Jef. Only several chapters later is it revealed that it wasn't Amdi that was defenestrated, but Vendacious.
Deceptive Disciple: Flenser was Woodcarver's offspring/creation and most brilliant disciple, until the nature of his experiments was revealed. Some characters including Flenser!Tyrathect even call out Woodcarver for creating such a monster and then just letting him go.
Downer Ending: If you read both A Fire Upon The Deep and A Deepness in the Sky, you realize that at the end of A Deepness in the Sky, Pham Nuwen points his fleet towards the unthinking depths of the galaxy, where (most likely) everyone dies in a futile attempt to learn the wonders of the galaxy — which happen to lie in the opposite direction. Pham Nuwen gets reassembled thirty thousand years later.
Dramatic Irony: The end of A Deepness in the Sky. Such dramatic irony. Pham has stumbled onto the secret of the galaxy's construction, except he has it backwards. Oops.
Earth-Shattering Kaboom: Wars in Beyond are fought with antimatter bombs and relativistic-speed kinetic projectiles, so these do happen.
"She knew about antimatter bombs and relativistic kinetic energy slugs. From a distance such weapons were bright spots of light, sometimes an orchestrated flickering. Or closer, a world-wrecker would glow incandescent across the curve of a planet, splashing the globe itself like a drop of water, but slow, slow."
Evilutionary Biologist: Flenser, sort of. The science on his world isn't nearly advanced enough to provide knowledge of genetics, but unique physiology of his race and complete lack of anything resembling morals or empathy allowed him to get really, uh, creative with literally constructing his subjects to his specifications.
Fantastic Racism: Both of the main villains in The Children of the Sky are racist towards each other's respective races. This, curiously, does not stop them from cooperating.
Becoming Focused is only better than being turned into the Blight's appendage insofar as you are at least no longer capable of understanding the horror of your situation.
Faux Affably Evil: Tomas Nau and particularly Flenser. In fact, master villains can be distinguished by ability to be charming and polite up to the moment Cold-Blooded Torture starts, and maybe even after, while inferior underlings and pretenders have trouble hiding their true nature.
Fighting from the Inside: A rare villainous example. Flenser struggles to suppress personality traits of Tyrathect and take complete control over their Hive Mind. He fails without realizing it, but gaining a conscience proves to be not a bad thing after all.
Gambit Pileup: In A Deepness in the Sky, Sherkaner Underhill and Pham Nuwen accidentally steamroller each other with their simultaneous Batman Gambits, giving Nau an opening to execute his own plan and nearly kill them all. He fails, but at the possible cost of Sherkaner and his wife's life, as well as many of his friends and staffers.
Giant Spider: A Deepness in the Sky features a whole race of them, and they LOVE humans. (Specifically, they think humans are absolutely adorable. Our big, googly eyes remind them of their own children.)
Good Is Not Dumb: Woodcarver, Ravna Bergsndot, Sherkaner Underhill... in fact, good damn well should not be dumb to prevail in this universe.
Have You Told Anyone Else?: In A Fire Upon the Deep, when Scriber discovers a weak point in Woodcarver's security and points it out to her intelligence chief — who turns out to be the double agent who created and makes use of the weak point.
Heel-Face Turn: Flenser!Tyrathect - there was quite a room for doubt about his sincerity, to be honest, but so far it sticks. Similarly, Steel, or at least his remaining part. A number of lower-caste Emergents might count, although they weren't really evil (rather than brainwashed and manipulated) to begin with.
In A Fire Upon the Deep, the Blight gets hoisted on a galactic scale by Countermeasure with the help of two Straumers, whose clumsy conspiracy it had written off as beneath its notice. Moreover, this only becomes possible because the Blight decides to murder the Old One just in case, when the latter was about to let it mind its own business. Lord Steel's army is defeated despite its vastly superior weaponry, because he had grown excessively reliant on intelligence from Vendacious, who got caught and was forced to lead Steel into a trap; then he is done in by Flenser!Tyrathect, whom he considered wholly inferior and safe to use, due to containing merely 1/3rd of former Flenser.
In A Deepness in the Sky, Tomas Nau is done in by Qiwi, remembering for one final time her mother's rape and murder.
In Children of the Sky, Vendacious is defenestrated from his own airship by those he tortured and used most mercilessly - Mr. Radio and Amdi.
Human Popsicle: Used by the Qeng Ho in A Deepness in the Sky, so they can survive the several century long voyages on their ramscoop ships.
Humans Are Special: Averted. Humans are not special at all. Well, except Pham Nuwen, who is so awesome that a Physical God who was as above normal sapients, as they are above fish, admitted to not being able to invent a personality like his.
it wasn't that Old One couldn't have invented Pham, Old One had to tone him down in order to use him.
Humans Through Alien Eyes: A large part of A Fire Upon the Deep is dedicated to this. Even though the human refugees ran into probably the most brilliant and scientific-minded Tines on the planet, the latter had serious problems figuring how these "alien creatures" tick.
Internet Backdraft: Invoked in A Fire Upon the Deep. On the interstellar equivalent of the Internet, humanity itself becomes a topic that causes backdraft after they get blamed for waking the Great Old One/AI.
It's All About Me: The true core of Emergents' ruling caste approach to life, as explained by Tomas Nau, but relentless, single-minded selfishness is probably the most defining trait of Vinge's villains in general.
Macross Missile Massacre: Seems to be the favorite form of combat in Beyond, from handguns that fire seemingly endless amounts of guided missiles, to swarms of jump-capable smart missiles in starship battles.
Noodle Incident: Pham Nuwen is a living, unusually bleak example of this trope, after his failed voyage to the Unthinking Depths. In addition, there are many references to his single-handedly ending a civilization-ending pogrom in a matriachal civilization (Strentmannian) with a single warship. Exactly how he accomplishes this is never explained, other then dark innuendo about atrocities committed.
Nuke 'em: How the mad governance of Tarelsk tries to deal with Qeng Ho fleet. It fails, but kills billions in the process.
In A Fire Upon the Deep, there is a race of beautiful butterfly-people with huge shining eyes. They're genocidal fascists.
In A Deepness in the Sky, this is how humans look to the Giant Spiders, and they think it's unspeakably cute. The humans resemble baby Spiders, who only have two eyes. When they mature, most of their carapace becomes one large visual sensor. Even very hard-bitten, cynical Spiders were hard-pressed to resist that effect.
Ragnarok-Proofing: The Spiders have to learn some of this to progress their civilization on a homeworld orbiting the On-Off star.
In A Deepness in the Sky, the effects of relativity, advanced medicine and prosthetics allows people to live hundreds or thousands of years. Pham Nuwen, constantly travelling, is possibly the oldest of the Qeng Ho, living hundreds of years from his perspective and much, much longer from most other reference frames. That, and he shows up in A Fire Upon the Deep - over thirty thousand years later.
A Fire Upon the Deep plays this straight with humans and many species of aliens (in fact, failure to uphold this trope on a low-tech world becomes a major plot point in the sequel), but inverts with Powers, which rarely exist for more than ten years, before losing interest in maintaining contact or changing irrecognizably.
The Hive Mind nature of the Tines means that an individual can incorporate new members as old ones die off, maintaining a continuous consciousness for many times the lifespan of an individual. Although it's not given how long a member would live, Woodcarver is over 600 years old and has seen glaciers advance and retreat over his/her lifetime. It eventually extracts a terrible price, though, as the only way to maintain one's identity after enough years is inbreeding within one's own members.
Renaissance Man: Woodcarver excels in several form of fine arts and basically invented the scientific approach, revolutionizing much of Tines' culture. On top of that he/she is a competent politician and military leader, and apparently was a Bad Ass warrior in his/her younger days. Pham Nuwen is a legendary trader, space navigator and politician, is very good at Slow Zone-level programming, and is as Bad Ass as they come, particularly when not undermined by advanced age.
Rock Beats Laser: Massively averted in A Fire Upon the Deep, where one civilian with a high-tech sidearm nearly wipes out a whole regiment of troops with medieval weapons and is only killed when natives use a primitive flamethrower.
Sealed Evil in a Can: In A Fire Upon the Deep, the Blight/Straumli Perversion is a program inside a multi-billion year old archive, let loose by unwitting archaeologists.
Space Opera: A Fire Upon the Deep in particular has a large scale.
Starfish Aliens: At least one species in each book, with extensively thought-out biology and culture. Still weirder beings are hinted at in A Fire Upon the Deep. In a partial subversion of the common use of this trope, despite extreme differences in physical makeup, all encountered races can understand each other and coexist. Only hyperintelligent Powers are truly different, and even they are only hyperintelligent, not truly transcendent and ineffable.
Staying Alive: It is unclear whether The Blight retained some self-awareness, even after being submerged into the Slow Zone, or just cooked up complicated programs for its fleet right before that, but said fleet is certainly alive and still intending to nuke the Countermeasure, alongside with the Tines' world, as soon as it gets there. Which might be far sooner than anyone's worst predictions.
The Slow Path: In A Deepness in the Sky, Thomas Nau spends no time in hibernation, so he ages faster than everyone else.
Tap on the Head: Completely averted in The Children of the Sky. The blow that knocks out Ravna is treated completely realistically, with various debilitating aftereffects until she gets advanced medical treatment.
Too Dumb to Live: Scriber. He dodges this trope at the very beginning, thanks to sheer luck, but it catches up with him the next time he tries to be useful. Played for tragedy, instead of humor particularly as without his well-intentioned but poorly-thought-out actions all the good guys would have been ultimately doomed. Either time.
Translation Convention: The spider sections of A Deepness in the Sky are written by human researchers, using this.
Troll: Flenser-Tyrathect apparently channels his residual sadistic impulses by getting a rise out of people. He picks underlings with similar inclinations too.
The Virus: The Blight. It can overtake whole civilizations at lightning speed, by infecting and assimilating their computer systems. It also can overtake living beings and turn them into its meat puppets. Normally, this takes High Beyond technology, but in the Low Beyond, it custom-created a race billions of years ago that can be instantly subverted at any distance - the Skroderiders.
Wham Line: Several in the books. A couple examples:
In A Deepness in the Sky: "It's all messed up now". When Sherkaner, half-blind and in shock, realizes that he and Pham Newen's Gambit Pileup have canceled one other out, costing the lives of almost all his assistants, staffers, and family.
In Children of the Sky, "They're Rider larvae, Jef," revealing Tycoon's "cuttlefish" as Skroderider larvae. Very shortly thereafter, she realizes that Greenstalk is among the adult Skroderiders in the colony, making it a double Wham Line. Oddly, this changes the plot not at all, save for one key thing: keeping Ravna and Jef out of Vendacious' claws.
Zero-G Spot: The problem of obtaining leverage during zero-g sex is mentioned in A Deepness In The Sky; also, one of the protagonists in A Fire Upon The Deep thinks that zero-g sex isn't what it's cracked up to be (again largely due to the difficulties of obtaining leverage safely).