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The Gallagher Girls series follows Cameron "Cammie" Morgan ([[CharacterNameAlias Chameleon]]) through her life as a {{Teen Superspy}} (in training). Along with her friends [[CuteBruiser Rebecca "Bex"]] [[TomBoy Baxter]], [[TheKlutz Elizabeth "Liz"]] [[TeenGenius Sutton]], and [[LonelyRichKid Macey McHenry]], Cammie learns the art of espionage at the [[SchoolForScheming Gallagher Academy for Exceptional Young Women]]. At first, the series is a light-hearted romantic comedy as Cammie starts falling in love with a guy and has to balance learning to be a spy with dating a seemingly-normal guy, but as the series continues, it [[CerebusSyndrome takes a sharp turn for the dark.]]

The books:
* ''I'd Tell You I Love You, But Then I'd Have To Kill You'' (2006)
* ''Cross My Heart And Hope To Spy'' (2007)
* ''Don't Judge A Girl By Her Cover'' (2009)
* ''Only The Good Spy Young'' (2010)
* ''Out Of Sight, Out Of Time'' (2012)
* ''United We Spy'' (2013)

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!!Tropes Include:
* AbsentMindedProfessor
* AcademyOfAdventure: Also a {{School For Scheming}}. I mean, the girls get to ride in helicopters and their final exam always involves copious amounts of ass-kicking.
* ActionGirl: Kind of inevitable in a series about an all-girls spy school.
* AfraidOfNeedles: Bex, a fact that surprised even Cammie.
* AirVentPassageway: Instead of using an air vent to get ''out'' of a building, Cammie and Macey use one to get back ''in'' when [[spoiler: they're attacked by a masked man and woman who want to abduct them. The attackers out-match them in terms of skill and all their security is inside.]]
** This option is discussed and then vetoed during the girls' covert operations final.
* AlliterativeName: Macey [=McHenry=].
** Mick Morrison
* AngerBornOfWorry: Bex and Macey [[spoiler: after Cammie returns from running away]].
* BadassCreed: "Who are we?" ''"The sisters of Gillian."''
* BadassFamily: The Baxters, definitely.
* BagOfSpilling: Cammie is introduced without [[spoiler: her father's journal]] in the fifth book. [[spoiler: It's later retrieved]].
* BeautyBrainsAndBrawn: Macey, Liz, and Bex, respectively. Cammie is somewhere in the middle of it all.
* BelligerentSexualTension: Abby and Townsend.
* BettyAndVeronica: [=DeeDee=] was the Betty and Cammie was the Veronica to Josh's Archie.
* BigLabyrinthineBuilding: Gallagher Academy, what with all its secret passageways and multiple subterranean classrooms.
* BilingualBonus: Seeing as the girls speak [[TeenGenius fourteen]] [[OmniGlot different languages]], this pops up from time to time.
* BookcasePassage: There's one of these in the Gallagher library.
* BornDetective: Pretty much every significant character in the series.
* BrattyTeenageDaughter: Macey is a genuine one in the beginning of the series, but as she finds herself at home in the Gallagher Academy, this behavior ends up just being her cover when with her parents.
* [[spoiler:BrainwashedAndCrazy: Cammie in the fifth book, to the point where she can assemble a gun in no time flat and have no idea how she did it.]]
* BuffySpeak: Not surprisingly, seeing as the majority of the characters are teenagers.
* CatchPhrase:
--> Cammie: How do you know about [insert secret here]?
--> [[spoiler: Zach]]: *points to self* Spy.
* CerebusSyndrome: While the first two books weren't exactly all laughs and giggles, the third and fourth really [[UpToEleven up the ante]], with much [[DarkerAndEdgier darker]] storylines being introduced.
* TheCharmer: [[spoiler: Zachary Goode from Blackthorne Academy, especially where Cammie is concerned.]]
* ChekhovsGun: [[spoiler: The stained-glass window from the first book]].
** Cammie's knowledge of the Academy's many secret passageways. It's mentioned throughout the series, and plays a minor role in the plot- but for the most part, it's just a way of fleshing out her character. [[spoiler:Then, in the final book, it's vital to the students escaping Catherine's bomb.]]
** The "sisters of Gilligan" speech that shows up at least once a book, during a meal. [[spoiler:It's one of the reasons they survive the booby-trapped Sublevels.]]
* CrossOver: The novella "Double Cross" crosses over with ''HeistSociety''.
* CurseCutShort
--> "So boys really ''do'' make passes at girls who kick --"
--> "''Bex!''"
* CuteBruiser: Bex.
* CuteClumsyGirl: ''Liz''.
-->"If I'm ever on a mission, I want Bex beside me and Liz far, far away, with about a dozen computers and a chessboard - a fact I couldn't help but remember when Liz tried to fling her suitcase onto the bed, but missed and ended up demolishing my stereo and flattening a perfectly-scaled replica of DNA that I'd made out of papier-mâché in eighth grade.
-->'Oopsy-daisy,' Liz said, throwing her hand to her mouth."
* DevelopmentHell: The movie that was supposedly in the works from Disney.
* DisappearedDad: Cammie's father is dead due to a mission gone wrong. The details of what happened exactly are unknown, and is a mystery that plagues Cammie's mind throughout the series.
** [[spoiler:As of the end of the fourth book, he's probably not dead all along.]]
*** [[spoiler:Although that may have been a lie to try to get Cammie to join the Circle]].
*** [[spoiler:As of the fifth book his death is confirmed.]]
** This is also the case for [[spoiler:Zach. In the sixth book, however, his mother (while under the effects of truth serum) confesses that Zach's father is in fact ''Townsend.'']]
* DrivesLikeCrazy: Bex, as she's used to driving on the ''opposite'' side of the road.
* ExpositoryHairstyleChange: Cammie cuts and dyes her hair bottle-black [[spoiler: while on the run]]. [[spoiler: She later has it bleached and returned to normal to deal with the emotional trauma]].
* FakeAmerican: Bex dons an American accent while giving the fake grand tour.
* ForWantOfANail: Cammie muses how life would have been if Cammie's father had survived and Bex's had gone missing in their childhood.
* FourGirlEnsemble: Cammie is the [[NaiveEverygirl sweet, naive one]], Bex is the {{tomboy}}, Macey is the sexy one, and Liz is the [[TheSmartGuy wildcard]].
** Although Liz is a bit naïve as well, and Cammie grows a lot less so over the series.
* GeniusDitz: While being published in a science journal at a very young age, Liz can't seem to stop herself from accidentally knocking over everything in sight.
* GirlNextDoor: Cammie.
* GossipyHens: Gallagher girls in general, but especially Tina Walters.
* GuiltyPleasure
* HandsomeDevil: Zach.
* HotTeacher: Mr. Solomon.
* IJustWantToBeNormal: Cammie, especially in the first book when her spy status makes it difficult to have a relationship with Josh, a regular civilian.
* IneffectualLoner
* KidnappedByAnAlly: Cammie is kidnapped by her mom and teacher, but only as part of the final exam.
* [[spoiler: LaserGuidedAmnesia]]: [[spoiler: Cammie forgets all that happened over the summer]].
* LiteraryAgentHypothesis: The first book (and presumably, all subsequent books) are written as Cammie's case reports.
** PlayedForDrama in the fifth book where the physical case report is left as a clue [[spoiler: to the key to destroying the Circle.]]
* LockedInARoom: PlayedForDrama in one of Ally Carter's [[http://allycarter.com/2008/01/the-deleted-scene-i-probably-shouldnt-post/ deleted scenes]], wherein Cammie and Zach get locked in one of the world's strongest safes.
* LonelyRichKid: Poor Macey; her parents care more about the campaign trail than her.
* LovableAlphaBitch: Macey, once she warms up to the main characters.
* ManlyTears[=/=]NotSoStoic: Joe Solomon, [[spoiler: after Aunt Abby gets shot.]]
* MasterOfDisguise: Many characters throughout the series (most notably [[ProperlyParanoid Mr. Smith]], who is allegedly the most wanted man in the world), though it shows up more prominently in the third book.
* MinoredInAsskicking: Liz may want to work behind-the-scenes, but she can take someone down if she wants to.
* MistakenForCheating: [[spoiler: Zach, with Bex]].
* NoodleImplements: In ''spades''. There are constant references to special spy techniques using everything from tableware to garden houses. Similarly, there is a ton of {{Noodle Incident}}s
* NotSoStoic: Bex, after almost being [[spoiler: stabbed by a sniper]].
* {{Omniglot}}: Apparently the students at Gallagher learn ''fourteen'' languages.
* OneGenderSchool: Of the all-girls variety. [[spoiler: There is also an all-boys variety, as was revealed in the second book.]]
* TheOneGuy: Zach becomes [[spoiler: the first and only male student at Gallagher]].
* PairTheSmartOnes: Briefly, Liz and [[spoiler: Jonas]].
* PhotographicMemory: Liz.
* PluckyGirl: Cammie.
* RedHerringTwist: In the second book, we're made to believe that [[spoiler: the Blackthorne boys are trying to expose Gallagher Academy's secrets to the public. Turns out it was all just a test.]] Then, in the third book, [[spoiler: it seems like enemy agents are out to get Macey [=McHenry=], who is the daughter of a senator/vice-presidential candidate. Turns out they're really after Cammie.]]
* RedPillBluePill: Cammie and the other girls must choose between continuing cove-ops or choosing a different class (resuming a somewhat normal life for them).
* SecretLegacy: [[spoiler: Macey [=McHenry=] is a descendant of Gilly Gallagher, the founder of the Gallagher Academy for Exceptional Young Women.]]
* SecretIdentity: Kind of necessary for spies. Most notably Mr. Smith, who has a different face ''every year''.
* ShorterMeansSmarter: Liz is described as the most petite of the group.
* ShoutOut: The girls have an argument between the superiority of [[Film/TheBourneSeries Jason Bourne]] [[CoolVersusAwesome or]] Film/JamesBond, and one of the girls has a famed ''GilmoreGirls'' marathon in the dorms. There are also lots of references to BuffyTheVampireSlayer in the first book.
* ShrinkingViolet: Anna Freeman.
* [[spoiler: {{Sleepwalking}}]]: [[spoiler: Cammie]].
* SmartPeoplePlayChess: Cammie mentions she'd rather have Liz with a chessboard than out in the field.
* SmarterThanYouLook: Macey turns out to have outstanding test scores and is versed in French.
* SpySchool: In a series about teenage girl-spies in-training, what else would you expect?
* SouthernFriedGenius: Liz.
* StreetSmart: Cammie, since it comes with the pavement artist territory.
* SuperSpeedReading: Liz, to go along with her PhotographicMemory.
* TakeThat:
--> '''Cammie''': [[{{Twilight}} Some girls would find it creepy if a guy was watching her sleep]].
* TeenGenius: Cammie identifies herself and the other Gallagher girls as geniuses, but the ultimate example is definitely Liz.
* TookALevelInBadass: After Cammie [[spoiler: returns from running away]], she finds out that Macey has trained to the level of her and her classmates.
* TwoferTokenMinority: Bex is black and the only British student at Gallagher.
* WakeUpGoToSchoolSaveTheWorld: The Gallagher girls can take down grown men without batting an eyelash, but when it comes to fashion and dating they need all the help they can get.
* WardrobeMalfunction: Cammie's strapless bra falls off during a ball at her school (which was actually a cumulative exam). Unfortunately, [[HilarityEnsues hilarity does not ensue]]. [[spoiler: Instead, a [[CodeEmergency Code Black]] is declared because someone has breached the school's security]].
* WhamEpisode: The last few chapters of the third book. Turns out [[spoiler: the Circle of Cavan wasn't after Macey for being a descendant of Gillian Gallagher - they were after ''Cammie'', for reasons unknown.]]
** Finding out that [[spoiler: Mr. Solomon is working with the Circle of Cavan]] is definitely one for Cammie, and probably the readers, as well.
** On top of that, towards the end of the fourth book, it is revealed that [[spoiler: the terrorist dead-set on killing Cammie is ''Zach's mother.'']]
** The fifth book. [[spoiler: Cammie gets hypnotised and is ordered to kill herself. She nearly does it.]]
* WhamLine: "Because the last name on that list is [[spoiler: Samuel P. Winters]]."
* [[spoiler: {{With Great Power Comes Great Insanity}}]]: [[spoiler: The ultimate fate of Catherine at the end of the sixth book, which eventually leads to her suicide (by standing in the midst of an explosion she rigged in the Gallagher Academy basement.)]]
** [[spoiler: However, the students and faculty are safely evacuated in time, preventing this from becoming a {{Murder Suicide}}.]]