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The fourth installment of ''Literature/TheChroniclesOfNarnia'' and the sixth book chronologically. A few months after ''Literature/TheVoyageOfTheDawnTreader'', Eustace, with schoolmate and fellow outcast Jill Pole, returns to Narnia, and is sent on a quest to rescue Caspian's long-kidnapped son Rilian from a witch, who rules an underground kingdom preparing for invading Narnia.

A film adaptation of the book has recently been greenlit by The C.S. Lewis Estate and The Mark Gordon Company. It is currently unknown when it will be released.

[[IThoughtItMeant Not to be confused with]] the band of the same name {{Silverchair}}.
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!!This book provides examples of:
* AdiposeRex: The Queen of the Giants of Harfang.
* AdvertisedExtra: The titular chair is important, but doesn't really feel important ''enough'' to have the whole book named after it.
* AnimalNemesis
* AuthorTract: At the end of the book, where the Lady of the Green Kirtle is set up as a HollywoodAtheist of the "completely evil" variety and Lewis puts into her mouth some deliberately skewed philosophical arguments against the existence of Aslan, although given her supernatural powers, she could be read as more like a demon than an atheist. Though she certainly is ''tempting'' the protagonists to atheism.
** The introduction rails against schools that go easy on bullies, the horrific environment they create, and how easily the system can be manipulated to make even the worst of bullies {{Karma Houdini}}s. C.S. Lewis was famous for considering schools a necessary evil, but this is the only Narnia book where it was front and center.
* BeneathTheEarth: Underland
* BigBad: The Lady of the Green Kirtle.
* BigEater: When Eustace is told the centaurs haven't finished their breakfast, he incorrectly assumes that they started late. Actually, they started before he awoke, and have been eating for several hours!
-->"A Centaur has a man-stomach and a horse-stomach. And of course both want breakfast. So first of all he has porridge and pavenders and kidneys and bacon and omlette and cold ham and toast and marmalade and coffee and beer. And after that he tends to the horse part of himself by grazing for an hour or so and finishing up with a hot mash, some oats, and a bag of sugar. That's why it's such a serious thing to ask a Centaur to stay for the weekend. A very serious thing indeed."
* BoardingSchoolOfHorrors: Jill's and Eustace's school, which is a mix of the author's personal experience and educational theories he spoke against in ''The Abolition of Man''. Unusually for the trope (and interestingly considering Creator/CSLewis's own childhood experience under a SadistTeacher), the school's abuses stem not from draconian discipline but from an indulgent ''lack'' of discipline that allows [[GangOfBullies gangs of bullies]] to run wild, terrorizing ordinary students like Jill and Eustace.
** The children's school seems to be more inspired by the "Wyvern" period of Lewis's life, as detailed in ''Surprised By Joy''.
* {{Brainwashed}}: A ''lot'' of people.
* BrownNote: The Lady of the Green Kirtle's mandolin has a pacifying brainwashing effect.
* CallForward: Since this book was published ''before'' ''Literature/TheHorseAndHisBoy'' (though written ''afterwards'') the mention of Cor and Aravis (as recited by a Narnian poet) and the ballad of Corin Thunderfist (whistled by Rilian in the Underworld) become this. Chronologically, they're a ''CallBack'', considering that in Narnia, they lived over a thousand years ago. Confused?
* CatchPhrase: Puddleglum has one, I shouldn't wonder.
* CatchphraseInterruptus: Puddleglum finally gets tired of all the "few return to the sunlit lands" stuff supplied by the warden and cuts him off, explaining that he already knows what's coming as the warden seems to only think about that one idea.
* ClippedWingAngel: The Lady of the Green Kirtle turns into a serpent [[spoiler:and Rillian chops its head off]]
-->[[EvilOverlordList 34. I will not turn into a snake. It never helps.]]
* CollapsingLair: Underland, after [[spoiler: the queen's death]].
* CuckooNest: The brainwashing sequence.
* CuriosityIsACrapshoot: Is the man in the Silver Chair telling the truth or lying?
* DarkIsNotEvil: The army of the Lady of the Green Kirtle is mostly composed of unwilling slaves. The witch herself aguably plays the [[LightIsNotGood opposite trope]].
** Not to mention that said unwilling slaves make their home deep in the ground, farther than anyone has ever gone. They think it's utterly fantastic and describe some nice things about it.
* EarTrumpet: Trumpkin uses one. This is both for comic effect (he mishears a good bit of information before he finally gets his ear trumpet) and to emphasize how old he is, and thus how much time has passed since the last trip to Narnia.
* TheEeyore: Puddleglum the Marsh-wiggle, though unusually for this trope, his pessimism saves their lives more often than not.
* EskimosArentReal: The Lady of the Green Kirtle claims not to believe in lions or any other aspect of the outside world. She's lying, but she nearly bewitches the overlanders into agreeing with her. This is a typical Creator/CSLewis allegory; in order to describe Aslan or Narnia to the Lady who says they don't exist, they have to do so in terms of things that she ''does'' accept the existence of, allowing her to dismiss it with "So you made up a bigger version of a cat, and called it a lion", in the same way as heaven, whether or not it exists, can clearly only described in terms of the mortal world by those who haven't experienced it (which may be everyone).
* ExoticEntree: The protagonists discover that the venison served at the table of the "Friendly Giants" came from a Talking Stag. Talking Animals are fully sentient and sapient beings with all the same rights as humans and other people-esque races (e.g. dwarves), so the author notes that for anyone of Narnian culture, this is the equivalent of cannibalism. [[spoiler: If that weren't enough, the characters later find out they are on the menu for the following night.]]
* FirstNameBasis: Eustace and Jill when the group begins to escape Underland.
* FishPeople: Marsh-wiggles, though they're more like amphibian people.
* FriendOrFoe: After [[spoiler:the death of the Lady of the Green Kirtle.]]
* GangOfBullies: The progressive teaching methods at [[BoardingSchoolOfHorrors Experiment House]] have the effect of indulging bullies while making learning difficult for other students. Jill and Eustace's attempt at escaping the bullies sets off the plot [[spoiler:and provides a satisfying moment of BullyHunter revenge at the end.]]
* GenreSavvy: Puddleglum on several occasions explains how quests like theirs tend to turn out, [[LampshadeHanging hanging a few lampshades]] as he goes, such as his guess of the Queen's reasoning for being a LoadBearingBoss.
* GrimUpNorth
* GodSaveUsFromTheQueen
* HaveAGayOldTime: "Gay", said Puddleglum... "That's what we've got to be. Gay. You must watch me, and do as I do. I'll be gay. Like this."
** Also, "[Jill] made love to everyone -- the grooms, the porters, the housemaids, and the elderly giant lords..."
* HeyItsThatGuy: In the BBC miniseries, Puddleglum is the [[TheNthDoctor Fourth]] [[Creator/TomBaker Doctor]].
* HookedUpAfterwards: A potential interpretation of Jill and Eustace's relationship, given Jill developing genuine affection for Eustace during their time in Narnia.
* {{Homage}}: Jill and Eustace's conversation with the witch before she turns into a snake is an homage to Plato's allegory of the cave.
* IAteWhat: See below.
* ImAHumanitarian: Not literally, but it's mentioned that in Narnian culture, eating talking animals is considered equivalent to cannibalism, as they have human-level intelligence. When Puddleglum finds out [[IAteWhat what the giants served him]], he has a massive attack of FridgeHorror and is momentarily almost DrivenToSuicide.
* JamesBondage: Rilian.
* KickedUpstairs: This happens to the Head of [[BoardingSchoolOfHorrors Experiment House]], after it is revealed that she is utterly incompetent at running the school. Played for laughs when she ends up in Parliament.
* KnightInSourArmor: Puddleglum. He will fight to the bitter end on the side of good and never doubt for a second and assume the worst every step of the way. His cynicism keeps Eustace and Jill firmly grounded and sensible.
* LadyAndKnight: The children meet the Lady riding with her Knight [[spoiler: (who turns out to be Rilian in disguise).]]
* LetsMeetTheMeat: Subverted in that [[spoiler:Puddleglum overhears some giants talking about the stag they were eating and how it had ''told'' them that it was tough and that they would not like it. Cue in-universe FridgeHorror]].
* LoadBearingBoss: The Underland floods once the Lady of the Green Kirtle is killed. Justified since she's a witch who set the place to magically self-destruct if she died.
* {{Mondegreen}}: Owing to being hard of hearing without his EarTrumpet, Trumpkin at first mishears "The girl's called Jill" as "The girls are all killed." He also mistakes "Eustace" for "Useless."
* MoreThanMindControl: The Lady's attempt to convince the four that Narnia doesn't exist and the Underland is the only world. It almost works, until Puddleglum decides their so-called fantasy world is far superior to the dreary "real" world of the Lady, thank you very much.
* MySpeciesDothProtestTooMuch: Puddleglum says that he's actually quite cheerful, at least compared to all the other marsh-wiggles.
* NoMatterHowMuchIBeg: Rilian.
* ObfuscatingStupidity: The tactic by which Eustace, Jill, and Puddleglum escape from Harfang.
* TheOwlKnowingOne: Eustace and Jill receive some guidance from Glimfeather and [[StealthPun the Parliament of Owls]].
* PatrickStewartSpeech[=/=]ShutUpHannibal: Puddleglum does an incredibly [[MomentOfAwesome awesome]] one. The BBC Television adaptation is more concise without losing any of its impact, especially when delivered by Creator/TomBaker himself. It can be seen [[http://www.youtube.com/watch?v=1Wuiq7j4nCA here.]]
-->'''Puddleglum''': There is one thing to say. Suppose we have only dreamed and made up these things, like sun, sky, stars and moon and Aslan himself. In that case, it seems to me that the made-up things are a good deal better than the real ones; and if this black pit of a kingdom is the best you can make, then it's a poor world. And we four can make a dream world to lick your real one hollow. As for me, I shall live like a Narnian! Even if there isn't any Narnia, so thanking you very much for supper. We're going to leave your court at once and make our way across your great darkness to search for ''our land'' '''ABOVE!'''
* PlayingDrunk: That's Puddleglum's story, at least.
* PlotSensitiveLatch: Near the beginning, Eustace and Jill are escaping from some bullies towards a door that is always locked, and of course it turns to be unlocked. Justified in that Aslan has magically caused this to happen, but they don't know it at the time.
* PrettyInMink: At one point, Jill is given a [[PimpedOutCape mantle trimmed with white fur]].
* QuickNip: Puddleglum drinks often from a brown bottle kept on his person, offers spirits to children (they don't like the taste), and on one occasion ends up utterly legless after downing a large cup of giant-strength liquor. It's cool; no one minds.
* RememberTheNewGuy: The species of Marsh-wiggles, which appear to be a familiar part of the Narnian landscape, but have never been mentioned before this book (oddly, not even in the genesis of Narnia, which C.S. Lewis wrote ''after'' this one).
* ScaledUp: [[spoiler: The witch.]]
* SilverHasMysticPowers: The title item has brainwashing powers.
* SlapYourselfAwake: Puddleglum employed this technique when he stomped out the fire that the Lady of the Green Kirtle was using as part of her hypnotic magic. Not only did it quash the aroma that was lulling the heroes into a trance, but the pain (he was barefoot) is specifically said to give him a moment's perfect clarity.
* SourSupporter: Puddleglum.
* StrawmanPolitical: Experiment House is basically Lewis' critique of modern secular education, and especially of experimental/progressive schools.
* TeethClenchedTeamwork[=/=]FireForgedFriends: Eustace and Jill.
* ThanatosGambit: The Green Lady has prepared spells that will cause her kingdom to be destroyed in the event of her death, thus presumably also taking out whoever killed her.
-->'''Puddleglum:''' "She's the sort that wouldn't so much mind dying herself if she knew that the chap who killed her was going to be burned, or buried, or drowned five minutes later."
* ToServeMan: The "gentle giants" are quite happy that the Lady of the Green Kirtle sent the three heroes to them for the Autumn Feast...
* TheVamp: The Lady of the Green Kirtle for Prince Rillian, even resorting to MindControl.
* TownWithADarkSecret: Harfang.
* UnfortunateNames: "His name unfortunately was Eustace Scrubb, but he wasn't a bad sort."
** This line is also a CallBack to Literature/TheVoyageOfTheDawnTreader. Eustace was [[CharacterDevelopment a lot meaner]] in that book, and was introduced with the line "There was a boy called Eustace Clarence Scrubb, and he almost deserved it."
* WhatHappenedToTheMouse: Lord Drinian (who was the Captain of the Dawn Treader) plays a fairly central role in the story of Rilian's disappearance, but is not accounted for in the present-day.
* [[WhyDidItHaveToBeSnakes Why Did It Have To Be Underground?]]: Jill's claustrophobia makes the trip to Underland through several dark, incredibly cramped passages and tunnels paralyzingly terrifying for her.
** Eustace has a similar aversion to heights.
* WishFulfillment: Arguably, [[spoiler: when Aslan, Caspian, and Eustace teach the bullies at the boarding school a lesson]]. Note that Lewis' autobiography, ''Surprised by Joy'', reveals that he had a bad experience at a boarding school.
** An in-universe example as well. [[spoiler:Caspian says several times how it is his dream to visit a land on a planet that's round. Aslan allows him to briefly visit Earth.]]
* WouldntHitAGirl: After [[spoiler:Rilian]] kills [[spoiler:the Green Witch]], he mentions that he's glad she [[ScaledUp turned into a snake]], because he would have felt guilty for killing a woman.
* YouHaveToBelieveMe: The man in the Silver Chair ''really'' doesn't do much to dispel their suspicions that he's a raving lunatic. [[spoiler: He's really just, during his brief moments of sanity, very aware of how strongly he's enchanted and he is beyond desperate to escape it, thus coming across as insane and reinforcing the lie that those few moments are of madness rather than clarity.]]
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