A fantasy novel for Young Adults by Creator/ChinaMieville.

[=UnLondon=] is the shadow of the city it is named for, one of many abcities that collect the mildly obsolete detritus left behind by the citizens of London. [=UnLondon=], and other cities like it, are places where the broken and neglected discover new purpose. It is a world in danger. The Smog threatens to choke the life out of every living thing it can find, to feed itself and drown the world in darkness.

Enter Zanna and Deeba, two ordinary girls who find themselves in [=UnLondon=] after a string of events lures them there. Zanna is the abcity's [[TheChosenOne chosen one]], the Shwazzy, who will ultimately destroy the Smog and save [=UnLondon=]. Unfortunately, the Smog knows this as well as the good guys, and injures Zanna before she can fulfill her destiny. Deeba, the Funny Sidekick, takes on the quest meant for Zanna. Helped by an abandoned milk carton and talking book of prophecy, Deeba must save the abcity and get back to regular London before everybody back at home forgets she even existed.

This book inverts, subverts and plays straight every prophecy trope in existence and is even the TropeNamer for TheUnchosenOne.

!!Provides Examples Of:

* AbnormalAmmo: The [=UnGun=]. Very abnormal, to the point that it probably doesn't even have bullets.
** To elaborate, it takes whatever you stick in the chambers and magnifies whatever it is. In Deeba's words, whatever it's loaded with, it uses well. For example, a shard of brick in the chamber will create a building as a prison, and a hair will cause smombies to literally explode with hair.
*** [[spoiler:And then [=UnFires=] when it's empty, acting as a huge vacuum; hence, the Smog is afraid of nothing ''and'' the [=UnGun=].]]
* BadassBookworm: Extreme librarians!
* ButNowIMustGo: [[spoiler: [[SubvertedTrope Subverted]]. After the final battle, Deeba is given the decision to go home or stay (since eventually her friends and family would forget her prolonged staying via phlegm effect), and decides to go home. Then, she surprises everyone by saying she'll visit often, chiding them for failing to realize how ''easy'' it is to cross between the worlds.]]
* CatsAreMagic: Subverted. Cats are the most stupid and ''least'' magical of all animals. Dogs, foxes, fish and various birds are shown to be sapient and able to cross the boundaries between worlds, but cats are too concerned with looking cool to learn anything of value.
* CityOfAdventure: [=UnLondon=].
* DecoyProtagonist: Zanna.
* DownTheRabbitHole: Or, in Deeba's case, Up the Wordhoard Pit.
* EmbarrassingFirstName: Suzanna, who prefers Zanna.
* EverythingsDeaderWithZombies: Or Smombies. Dead bodies animated by the Smog inside them.
* FantasticRacism: The story features largely irrational racism between living beings and ghosts; specifically, the ghosts supposedly steal bodies. Woe to the only known half-breed: everybody mistrusts him. All the more noticeable as the inhabitants of the eponymous city otherwise display extraordinary diversity and tolerance.
* FetchQuest: The hunt for the [=UnGun=].
* HalfHumanHybrid: Hemi is half-ghost. [[{{Squick}} Don't think about it too much.]]
** [[DiscussedTrope Deeba openly questions this]], and Hemi explains ghosts [[DoubleEntendre can get physical]] for mating.
* HaveYouToldAnyoneElse: Deeba falls for this.
* HurricaneOfPuns: The [[PunnyName Punny Names.]]
* InfinityPlusOneSword: Subverted with the Klinneract. Played straight with the [=UnGun=].
* KilledOffForReal: [[spoiler: Diss was washed/flushed away when fighting Parakeetus Claviger and Rosa, while not dead, [[FateWorseThanDeath was captured by a Black Window]]. Deeba honors their memory by naming their ɹɐɔ the ''"Diss&Rosa"''.]]
* LaserGuidedAmnesia: [[spoiler:Zanna, after being attacked by a Stink-Junky and having the Smog enter her lungs. The Smog gets out, but her memories go with it.]]
* LinkedListClueMethodology: [[DefiedTrope Defied]].
* MobileFishbowl: Skool walks around in a diver's suit full of water. [[spoiler:Skool is a sentient school of assorted aquatic creatures, mostly fish. It's that kind of book.]]
* {{Mooks}}: Stink-Junkies, Unbrellas, Binja, Utterlings, etc.
* MookFaceTurn: [[HurricaneOfPuns Words don't always do what you want them to do.]]
* NewWeird: For kids.
* NighInvulnerable: The Smog, of the Made of Air variety.
* NinjaPirateZombieRobot: Trash Bins + Ninja = The best pun ever!
* NonHumanSidekick: Curdle the milk carton.
* OffTheRails: Starts when TheChosenOne [[spoiler:gets bonked over the head and loses her memory of all this, then invoked by Deeba because she deduced (correctly) there's no way to stay on the rails and they didn't have time for [[FetchQuest fetch quests]].]]
* OneParagraphChapter: The chapter entitled "The Powerful Resurgence of the Everyday" consists entirely of the sentence "Of course she was wrong."
* OurGhostsAreDifferent: They can mate with the living.
* [[OurZombiesAreDifferent Our Zombies Are Puppets For Sentient Smog]]
* PaintingTheMedium: Some minor usage:
** Mr. Speaker speaks [[foldercontrol]]

[[folder: in small caps ]]
** The boat used in the final battle is the frame of a car turned upside down; hence, it's called a "ɹɐɔ." {{Lampshaded}}: [-"A ... rack? I can't say it."-]
*** [-"Easiest way is to bend over and say car."-]
* PlotCoupons: Played straight, then subverted. Deeba gets the first plot coupon, then realizes that it would waste time and people to get the 5 unnecessary ones, so she goes straight to the [=UnGun=]. Double-subverted when Deeba realizes she actually ''needed'' the plot coupons, but she is able to work around that.
* PluckyComicRelief: [[spoiler: Deeba's]] intended role.
* PropheticFallacy: [[spoiler: Mistakes in the prophecy result in the one thing the Book thought a misprint actually being correct.]]
* PunnyName: Pretty much the whole ''point'' of the book. Abcities, utterlings, Binja, the [=UnLondon=]-I, the Black Windows (who live in Webminster Abbey), the list goes on.
* RoofHopping: Subverted by the Slaterunners: "[[spoiler:You thought there were ''houses'' under the roofs? That would be [[PunctuatedForEmphasis madness]]! Just because we want to live free doesn't mean we shouldn't consider [[NoOSHACompliance safety]].]]"
* RousingSpeech: Given by Deeba in Chapter 81.
* ScrewDestiny: Used successfully by the BigBad in removing TheChosenOne from the equation. Would have succeeded, had Deeba not pulled it herself and become TheUnchosenOne.
* ShockAndAwe: Conductor Jones. Note the conductor part.
** As he explains in the book, he's a bus conductor; he conducts himself with dignity, conducts his passengers safely on their journey, but there is a third thing those who take the oath learn to conduct: [[spoiler:electricity.]]
* SixthRangerTraitor: [[spoiler: Lecturn. To be fair, she DID know Deeba was right, that Brokenbroll needs to be stopped and came to join her with an army of Binja, but she caved in fast when believing all hope was lost and gave away the [=UnGun=] to him.]]
* SpaceWhaleAesop: Though it's by no means the main theme of the book: "Don't pollute, or else the smog will evolve sapience and take control of people's minds, making them destroy a fantasy world and then ours."
* SpoilerOpening: Of a sort with the North American cover. Blonde Zanna is the DecoyProtagonist, and while the girl on the cover is obscured, she looks Asian enough for people to deduce that it's actually Deeba, who is the real main character. (The original UK cover just shows a Binja among flowers and buildings.)
* TheChosenOne: Zanna. But the trope is played with - this book is the TropeNamer for TheUnchosenOne, after all.
* TheUnchosenOne: Deeba. Also the TropeNamer.
* ThemeNaming: Other "mirror cities" like [=UnLondon=] have names like No York, Parisn't, Baghdon't and Lost Angeles.
* TheWormThatWalks: Early in the book we hear, in passing, of a [[VideoGame/KingdomofLoathing guy made of bees]]. Also [[spoiler:Skool, though he's more fish than worm.]]
* {{Trickster}}: Hemi begins the story as a thief with questionable motives.
* VillainWithGoodPublicity: There are two: [[spoiler:Brokkenbroll]] in the abcity and [[spoiler:Minister Rawley]] in the real world.