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''Incarceron'' is a ScienceFiction (with the feel of, and marketed as {{Fantasy}}) duology by Catherine Fisher. It tells the story of the prison complex known as Incarceron. Incarceron is infinite, inescapable, and to top it off, it's a malevolent sentient being hell-bent on forever confining the thousands of inmates inside it. No one enters, no one escapes except one boy. Finn is a troubled inmate with vague memories of another life outside the prison.

During a struggle within the prison, Finn finds a crystal key, which he and many others believe may be the key to Incarceron. He soon discovers that the key has another purpose; through the key, which turns out to function as a communication device, he meets a girl named Claudia. Claudia claims to live Outside Incarceron, but is doomed to an arranged marriage. With help from Claudia and from visions of the legendary Sapphique, Finn is determined to unlock the mysteries of his past and perhaps escape from Incarceron.

The sequel and conclusion, ''Sapphique'', reveals greater problems now that Finn has Escaped and is challenged as crown prince by a remarkably similar boy.
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!!These books provide examples of:

* ActionGirl: Attia.
* AIIsACrapshoot: Incarceeron started out okay, but went horribly wrong. [[spoiler: In the end he's calmed via Jared]].
* TheAlcatraz: Since the creation of Incarceron, only Sapphique has escaped, although the Warden may come and go as he pleases.
* AlienSky: A few of Incarceron's wings have these.
* AntiHero: Finn and Keiro.
* [[spoiler: BadFuture]]: TheReveal near the end of Book 1.
* BelligerentSexualTension: Between Keiro and Attia.
* BigBad: Queen Sia.
* BiggerBad: While Queen Sia is the main threat in the Realm, the true evil is Incarceron.
* BittersweetEnding: [[spoiler: Incarceron is calmed down and the masquerade has been broken, but some characters are dead and the Outside is reduced to a wasteland]].
* BodyHorror:
** The Half-Men are people who have been "repaired" by Incarceron with robotic components.
** Chain-gangs are groups of people fused together and sharing a consciousness. They assimilate their victims.
* BriarPatching: One of the tales of Sapphique involves him facing off against a giant mechanical wolf that threatens him with many deadly fates, but Sapphique begs above all else, not to be thrown into the lake. Of course, when he is thrown into the lake, he swims to safety.
* BreakingSpeech: Incarceron is very proficient at this.
* ChessMotifs: Barely noticeable in the first book, but emphasized more in Sapphique.
* CommLinks: One of the properties of the keys.
* CosmicPlaything: The prisoners.
* CrystalDragonJesus: Sapphique, who is said to have been the only known escapee, is worshiped as a god, and is sometimes called "The Nine-Fingered One" by his followers. He gained this nickname [[spoiler:as the result of losing one of his fingers to a beast within the Prison.]]
* [[spoiler: DrivenToSuicide]]: [[spoiler: Evian when his assassination attempt fails.]]
* {{Dystopia}}: Incarceron became one when men lost control over it.
** Outside could also be considered one, with the way Protocol keeps everyone in an enforced Era.
* EarnYourHappyEnding: The characters have to go through a lot, but the books end with things much better than at the start.
* EldritchAbomination: Incarceron itself is pretty much this, albeit created by man.
* EvilTwin: [[spoiler: The fake Giles (the Pretender)]].
* FollowInMyFootsteps: Claudia's father, the Warden of Incarceron, has raised her to succeed him and become the ruler of the Realm.
* GeniusLoci: Incarceron.
* GildedCage: The Realm at first looks like a perfect place (for the rich at least), but it's actually ruled by a tyrannical elite who enforces Protocol. Just like in Incarceron, people are not free.
* GodSaveUsFromTheQueen: Queen Sia is the BigBad, and oppresses her people.
* GoneHorriblyWrong: Incarceron.
* [[spoiler: GoodAllAlong]]: [[spoiler: Lord Evian, though "good" [[WellIntentionedExtremist may be a speculative term.]]]]
* GoodIsNotNice: Keiro is a callous CombatPragmatist that everyone but Finn seems to assume will betray them the second it's convenient for him, but he honors his bond with Finn and saves him and Attia several times throughout the books.
* GrandTheftMe: [[spoiler: A heroic example; Jared puts on Sapphique's glove and enters the body Incarceron was trying to use]].
* GreatEscape
* HadToComeToPrisonToBeACrook: [[spoiler: Before he was put into Incarceron, Finn was a gentle prince. His time in Incarceron changed him a lot, as lampshaded by many.]]
* HandicappedBadass: Jared's sickness tacks an "invalid" label on him that most everyone agrees upon. It doesn't make him any less of a badass.
* HellholePrison: Incarceron treats its prisoners as playthings to manipulate for its own enjoyment.
* IJustWantToBeHuman: [[spoiler: Incarceron's goal in ''Sapphique''.]]
* IncurableCoughOfDeath: Jared.
* [[spoiler: ItWasWithYouAllAlong]]: [[spoiler: Claudia had been looking for an entrance to the Prison behind the gate, but found nothing. Only later is it revealed that the Warden keeps it as a charm on his watch.]]
* JerkWithAHeartOfGold: Keiro.
* LaserGuidedAmnesia: Finn. He can't remember his childhood, but recalls vague bits from his past.
* LiteralSurveillanceBug: A creation of Jared's.
* LukeIAmYourFather: [[spoiler: Inverted. Claudia is revealed to not be the Warden's daughter; she was born in Incarceron.]]
* MacGuffin: [[spoiler:The keys.]]
** [[spoiler: Sapphique's glove in the sequel.]]
* MadeOfIron: A bit literally for Half-Men [[spoiler:and Keiro]].
* MedievalStasis: A collection of laws, simply known as Protocol, forbid progress in the outside world (although the Era they are trying to emulate is more like the Renaissance or later than the Middle Ages).
* MouseWorld: [[spoiler: Incarceron is contained within a cube that the Warden wears, and people enter it by crossing some kind of time-space barrier.]]
* PatchworkMap: Incarceron's wings are varied in climate and what's inside them.
* PollutedWasteland: Several landscapes inside the prison, and [[spoiler: what the Outside really is]].
* PrinceCharmless: Caspar.
* RedEyesTakeWarning: Incarceron's eyes are red.
* SatisfiedStreetRat: Keiro ''oozes'' this.
* ScavengerWorld: Both inside and outside the prison.
* ScienceFantasy: The novel has both fantasy and sci-fi elements.
* ShroudedInMyth: Sapphique.
* SilkHidingSteel: Claudia
* SinisterSurveillance: Incarceron's Eyes.
* SplitPersonalityMerge: While they were originally separate, at the end [[spoiler: Jared's gentle personality is placed within Incarceron's, calming him]].
* SuperIntelligent: The Sapients, who created Incarceron and now hold all the advanced knowledge of the past before Era.
* TheStoic: Playing the nobility game Outside means being this all the time. The Warden is a master in hiding his emotions, and Claudia has learned from him (but she is less stoic when with Jared).
* TheWallAroundTheWorld: Near the end of the first book, Finn and gang fly a silver airship into the hole of what seems to be this. Whether or not it actually was is debatable.
* ToughLove: Although John Arlex is hard on Claudia and has essentially raised her to become the perfect Queen, he eventually admits that he grew to love her as a true daughter.
* TraumaInducedAmnesia: [[spoiler: Finn had this]].
* UnderestimatingBadassery: Everyone underestimates Jared.
* TheUnmasquedWorld: At the end of ''Sapphique'', [[spoiler: the holograms and everything that kept the nobility in power]] are broken, and the people can see what the world ''really'' looks like.
* WeatherControlMachine: Incarceron controls its own climate, able to make the temperature unbearably hot or freezing cold.
* {{Well Intentioned Extremist}}s: The Steel Wolves.
* WhatCouldPossiblyGoWrong: Let's face it, a sentient prison is not a good idea. Especially if there is no way out whatsoever.
* YouAreWhatYouHate: [[spoiler: Keiro hates the Half-Men, people with mechanical limbs that were either born with them or "fixed" by Incarceron. It later turns out that Keiro himself is a Half-Man, and one of the reasons he hates them so much is because he was born with it and he's not sure how far the mechanical parts go.]]
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