The ''[=ColSec=] Trilogy'' (''Exiles of [=ColSec=]'', ''The Caves of Klydor'', and ''[=ColSec=] Rebellion'') is a young-adult s-f series by Douglas Hill (of ''Literature/LastLegionary'' fame), first published in the 1980s.

AfterTheEnd, [[PoliceState an authoritarian regime has seized control of what's left of civilization]]. Criminals and dissenters are [[PenalColony shipped offworld]] by the Colonization Section of the world government. If they can build a colony, the world is ripe for exploitation; if they don't live that long, they're no great loss.

One particular group of deportees crash-lands. The survivors decide that they're going to do things their own way, the world government be damned.

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!Provides examples of:
* ActionGirl: [[TheBigGuy Heleth]], unequivocally. [[TheSmartGuy Samella]] [[TheLancer Connel]] also has her moments.
* AerithAndBob: Names are either [[OnlyOneName singular]] and fantastical (Jeko, Heleth, Rontal), or consist of a slightly unusual or fairly ordinary given name paired with a fairly ordinary (if sometimes [[MyNaymeIs idiosyncratically spelled]]) surname ([[TheHero Cord MaKiy]], Samella Connel, Bren Lathan). Being as it's AfterTheEnd, [[FridgeLogic it's possible that this is the result of language drift]].
* AfterTheEnd: Set a century and change after [[ApocalypseHow human die-back]] over much of Europe, Asia, and eastern North America. References to the "Virus Decades" imply that this was caused by some sort of plague.
* AtArmsLength: At one point in ''Exiles'', Jeko and Heleth get into a heated argument that threatens to turn into an actual fight. Cord breaks it up by straight-arming Jeko. (Although Cord isn't stated to be taller than Jeko—both boys are kind of shorties—he's stockier and a ''lot'' stronger.)
* AuthorTract: Not obnoxiously so, but you can kind of tell that Hill's views were fairly anti-authoritarian. There's also a faint undercurrent of anti-corporatism and/or environmentalism—Cord's simple life in the idyll of the Highlands before his exile, the unspoiled new worlds of the Colonies being exploited by the grasping Organization.
* BetterToDieThanBeKilled: [[spoiler:Bren]] tries to pull this several times. [[spoiler:He survives to the end of the series nonetheless.]] There's also [[spoiler:Samella's ploy in the asteroid mine]].
* BigDamnHeroes: [[spoiler:Heleth and Rontal]] play this role towards the end of ''Exiles'' by [[spoiler:intervening in the fight with the [[AdvancingBossOfDoom giant worm]]]]. And in ''Rebellion'', [[spoiler:Jeko, Rontal, and Stele]] play this role when they [[spoiler:break Cord, Bren, and the girls out of the prison transport]].
* BlindedByTheLight: Heleth gets a face full of high-beams in ''Rebellion'' and actually faints from pain.
* BraveScot: Cord is the descendant of back-to-the-land types who retreated to the Scottish Highlands so as to not be bothered by The Organization. He pretty much plays the trope straight.
* CrapsackWorld: The Organization's Earth (aside from a few tiny pockets of territory that they don't deem worthwhile) makes the colony worlds—no matter how rough and dangerous—look [[GhibliHills positively idyllic]] by contrast.
* CombatPragmatist: Samella is a [[ReluctantWarrior surprisingly]] dirty fighter. Sometimes [[AHandfulForAnEye literally]], no less.
* CurbStompBattle: Cord may be a [[CharlesAtlasSuperpower physical powerhouse]], but he's no match for someone with extensive combat training. [[spoiler:Good thing Samella was able to find the spare batteries for the [[RayGun laserifle]].]]
* DeadpanSnarker: Seems to be one of Rontal's main personality traits.
* {{Determinator}}: Cord, full-stop. [[spoiler:At the end of ''Caves'', the government killer Warreck [[NotQuiteDead turns out to be one as well]].]]
* DumbBlonde: Samella inverts this by being TheSmartGuy of the group.
* EeriePaleSkinnedBrunette: Heleth, who's also got [[FacialMarkings facial tattoos]].
* {{Egopolis}}: Inverted at the end of ''Rebellion''. [[spoiler: It's the ''rest'' of the kids—at Cord's suggestion—who want to name the newly-discovered world after Samella]].
* EliteMooks: The Organization's equivalent of a police force, the Civil Defenders, have an elite branch who're better armed and (supposedly) better trained. They're called Crushers, and are frequent antagonists in the second and third novels. Elite paramilitary police, outfought by street gang members. Money well invested.
* TheEmpath: Samella, again, although this ''only'' factors into the plot at all in ''Exiles''.
* [[spoiler:EverybodyLaughsEnding:]] In [[spoiler:the next-to-last chapter of]] ''Rebellion'', everyone just loses it at some tension-breaking silliness [[spoiler:after the asteroid battle]].
-->[[spoiler:'''Bren:''']] "Nothing funnier than victory?"
-->[[spoiler:'''Cord:''']] "Nothing sweeter, anyway."
* EvilAlbino: Lamprey, the main antagonist [[spoiler:of ''Exiles'']], is deathly pale and prematurely white-haired. He's also a [[ChaoticEvil vicious, unpredictable]] trained killer.
* FieryRedhead: Cord has anger issues, especially if [[BerserkButton Samella is endangered]]. They're somewhat mitigated, however, by his introversion and [[ChaoticGood relentless decency]].
* FiveManBand: More or less, although most of the central cast overlap archetypes. (Samella, for example, is ''mostly'' TheSmartGuy, but occasionally also plays the role of TheLancer—level-headed and extroverted where Cord is introverted and occasionally quick-tempered—and TheHeart.)
* FourTemperamentEnsemble: Cord is Leukine with Choleric tendencies, Samella is Phlegmatic, Heleth is straight-up Choleric, Jeko is Sanguine, and Rontal is Melancholic.
* {{Frameup}}: What got Samella exiled. Some other [[GotVolunteered indentured workers]] at the computer firm [[GreenEyedMonster got jealous of her skills]] and falsely accused her of theft.
* TheGadfly: Jeko. Heleth is his preferred target, but he's also gone after Cord a couple of times.
* GenkiBoy: Jeko again.
* {{Gonk}}: Lamprey is rather blatantly described as one—[[EvilAlbino pallid]], cadaverous-looking, and [[FangsAreEvil sharp-toothed]].
* GotVolunteered: Samella's family sold her into indenture out of desperation.
* GroinAttack: In the third book, [[spoiler:Samella]] first [[AHandfulForAnEye flings dust in a thug's face]], then kicks him in the nuts while he's distracted.
* AHandfulForAnEye: See above. "[[CrowningMomentOfAwesome Now who needs looking after?]]"
* HotBlooded: Cord (who verges on {{Berserker}} status), Heleth (who occasionally hauls off and belts people who needle her), Jeko (whom Rontal calls an "action junkie" at one point).
* HumansAreWhite: Averted. Cord, a redheaded, freckle-faced Scot, is the only central character who seems to be explicitly white. Samella is a gray-eyed blonde with an Irish surname, but apparently [[DarkSkinnedBlonde still looks tanned after three years indentured to an electronics firm]]; Heleth, although pale from living underground for the first seventeen years of her life, is ambiguous. Jeko and Rontal are explicitly ''not'' white; Rontal is black, Jeko is Japanese-American.
* IfYouKillHimYouWillBeJustLikeHim: Played straight more than once.
* IfWeSurviveThis: Heleth threatens to make Jeko regret [[YouAreFat insinuating]] that she [[FormerlyFat used to be chubby]] in ''Rebellion''.
* ImHavingSoulPains: Samella gets migraines in ''Exiles''. [[spoiler:It's because the [[WhenTreesAttack sapient trees]] are freaking out.]]
* InnateNightVision: Heleth has this, with the [[PowerAtAPrice drawback]] of [[DayHurtsDarkAdjustedEyes light sensitivity]]. Exactly ''how'' she got that way is left ambiguous; however, Samella speculates in ''Caves'' that Heleth and the rest of the inhabitants of the tunnels under London may be some sort of mutants.
* InevitableWaterfall: ''Caves'' begins with the five central characters rafting down a river. The first line of dialogue in the book?
-->'''Samella''': "I think the current's speeding up."
* KarmicDeath: [[spoiler:Lamprey meets a quite literal DeathOfAThousandCuts at the hands of Klydor-native humanoids]] towards the end of ''Exiles''. In ''Rebellion'', [[spoiler:Tuller meets a similar fate at the hands of his own gang]] after [[TheStoolPigeon selling everyone out]].
* KillHimAlready: Heleth pretty much outright yells this in ''Exiles'' when [[spoiler:Samella has Lamprey at gunpoint]].
* MeaningfulName: Lamprey boasts that he earned his NomDeGuerre for his tenacity. He could just have easily have earned it by virtue of being as ''mean'' as an eel, or by virtue of being an emotional parasite on the central cast.
* MyNaymeIs: Cord's surname is an obvious phoneticization of "[=McKay=]."
* {{Nephewism}}: Cord was raised by his uncle.
* NatureHero: Cord is a {{downplayed}} example. He grew up in an isolated corner of Scotland, has extensive wilderness survival skills, and is introverted and socially naďve; also, [[WildHair his hair is described as somehow unruly]] in every book.
* NoBiochemicalBarriers: Not universal, but explicitly stated to be true of Klydor specifically: It's more-or-less safe to forage in the woods, but watch out for predators.
* NotGoodWithPeople: Samella calls Cord out for being socially naďve in ''Exiles''.
* NoYou: When [=ColSec=] Commandant Mirvandel [[YouHaveNoChanceToSurvive demands the rebels' surrender]] [[spoiler:in the asteroid mine]] in ''Rebellion'', Jeko's response is a catcall:
--> '''Jeko:''' "You throw ''your'' guns down and come out!"
* OneHandedZweihander: Cord's [[ImprovisedWeapon improvised]] [[CarryABigStick bludgeon]] in ''Exiles'' is stated to be heavy enough that "many people" would need both hands to wield it effectively. And Cord uses it one-handed, apparently just because he ''can''.
* OnlyOneName: Tends to be true of people living, shall we say, ''outside'' the law (Jeko, Heleth, and Rontal included).
* PenalColony: Every habitable planet is treated as one. There [[AmbiguousSituation may or may not]] also be one in Antarctica.
* PoliceState: The entire ''world'' has pretty much become one.
* RagtagBunchOfMisfits: The central cast. [[spoiler:Can also be applied, all things considered, to the rebel army as a whole.]]
* RedHeadedHero: Cord, although his hair is specifically described as dark auburn.
* ReluctantWarrior[=/=]TechnicalPacifist: Samella is the least physical of the central cast, and seems to have a moral opposition to killing. That said, [[CombatPragmatist in a pinch]], she's not afraid to [[spoiler:threaten to [[KneeCapping put holes in someone's kneecaps]], [[AHandfulForAnEye throw dust in faces]], [[GroinAttack kick crotches]], or [[TakingYouWithMe rig an asteroid mining operation to self-destruct]] and [[BetterToDieThanBeKilled kill everyone present at her next keystroke]]. (She admits, however, that she wouldn't have had the nerve to go through with actually pushing the button)]].
* RoaringRampageOfRevenge: What got Cord exiled. His uncle[=/=]adoptive father was turned away from a hospital and left to die; Cord tried to trash the place. (And that was only the first of ''several''.)
* {{Robinsonade}}: Of sorts.
* RunningGag: Samella calling Cord a "barbarian."
* SandWorm: A recurring threat in ''Exiles''. Justified in that they have tough exoskeletons and don't dig themselves in that deeply.
* SelfDestructMechanism: [[spoiler:Samella]] rigs [[spoiler:the entire asteroid]] to detonate at her next keystroke [[spoiler:in the final battle in ''Rebellion'']]. [[spoiler:Samella's and Bren's]] acts of VehicularSabotage, in ''Exiles'' and ''Caves'' respectively, may also count, although the former was only such by virtue of the freighter's lack of re-entry shielding.
* ShipTease: A [[ImpliedLoveInterest clearly deliberate one]] for Cord and Samella; although it's never [[OfficialCouple outright stated]], it's fairly clear that he's in love with her by ''Rebellion'', and she seems to reciprocate. Jeko and Heleth have an [[AwLookTheyReallyDoLoveEachOther implied]] but much more subtle (for a certain [[BelligerentSexualTension value]] of "subtle," that is) one.
* SixthRanger: [[spoiler:Bren, by the end of ''Caves''.]]
* TheStoolPigeon: [[spoiler: Tuller]] is a "Betrayer Barry" of the "just a {{jerkass}}" variety. [[spoiler:He gets his [[KarmicDeath comeuppance]] in the end.]]
* StoutStrength: Cord plays with the trope. He's ''very'' strong (bordering on CharlesAtlasSuperpower territory) and looks pudgy when fully clothed (partly on account of being built like a fireplug, partly on account of being baby-faced). However, when he [[ClothingDamage loses his shirt]] during a fight in the first book, he's revealed to actually be quite trim.
* SuperSenses: Along with her InnateNightVision, Heleth has incredibly keen hearing.
* TeamDad: Although he does his best to treat the (much younger) five central characters like equals, [[spoiler: Bren seems to somewhat fall into this role after the end of the second book]].
** TokenAdult
* TrueCompanions: The five main characters by the end of ''Exiles''. [[spoiler:By the end of ''Caves'', Bren has become a SixthRanger.]]
* {{Tsundere}}: Heleth is a type A. She's always bickering with Jeko (and, to a lesser degree, almost everyone else), but there's the occasional implication that she doesn't outright hate him.
* UnskilledButStrong: Cord is ''not'' a trained martial artist, but anything he can actually land a punch on is usually out for the count.
* UnusualEuphemism: Heleth uses "yeck" as both a euphemism for (probably) "shit" and as an expression of disgust.
* VehicularSabotage: The series all but starts out with [[spoiler:[[AddedAlliterativeAppeal Samella sabotaging a spacecraft]]]], thus [[ItMakesSenseInContext allowing the central cast to survive in the first place]]. In ''Caves'', [[spoiler:Bren does away with Warreck by [[SelfDestructMechanism rigging his escape ship's engine]] to overload]].
* WhatHappenedToTheMouse: Samella's {{empath}}ic ability never comes into play again after ''Exiles''.
* WhenSheSmiles: Samella plays it straight.
* WoundedGazelleGambit: Cord sets out to [[spoiler:rescue Bren from the clutches of the Crusher team]] in ''Caves''. His plan involves [[spoiler:feigning a broken leg until he can sucker-punch Warreck]]. Things don't go entirely according to plan...[[spoiler:but luckily, Bren wasn't actually unconscious, just playing possum.]]
* WrenchWench: Samella, although computer hardware is more her forte.
* YouAreFat: Cord is on the receiving end of ''quite'' a bit of this in ''Exiles'' (and it's lampshaded at the beginning of ''Caves''). This is ''mostly'' due to Lamprey trying to stir the shit. And in ''Rebellion'', Jeko inverts this at Heleth, stating that she "[[FormerlyFat doesn't look as fat as she used to]]." (Neither character ''is'' fat, although both are solidly built.)
* YouHaveNoChanceToSurvive: The Organization's prime flunkies seem fond of this. [[spoiler:It never works.]]

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