A {{thriller}} centered on the conflict between TheProtagonist and TheConspiracy, often with an elaborate ConspiracyTheory as the background.

The story starts off with either a minor meaningless crime or a high-profile murder. A person related to the criminal blamed or the uncovered victim notices some odd discrepancies in the official story and digs deeper. Before the protagonist realizes it, he/she/it are caught in a multi-layered plot that involves possibly EVERYONE, especially those [[ProperlyParanoid who are tasked with the official investigation]]... meaning that the hero/heroine can't go to the cops... or the press... or that janitor in the hallway they just passed who looks a little too much like the guy who'd been shadowing them the last day or so...

See also [[SoYouWantTo/WriteAConspiracyTheory So You Want To: Write A Conspiracy Theory]], for those interested in writing their own Conspiracy Thriller.
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!!Examples of conspiracy thrillers include:

[[index]]
* ''Film/AllThePresidentsMen'': Practically the TropeCodifier. Making it worse is that [[TruthInTelevision it really happened]]: [[ScandalGate Watergate]].
* ''VideoGame/AlphaProtocol''
* ''Film/CapricornOne''
* ''Film/CaptainAmericaTheWinterSoldier''
* ''Film/TheChinaSyndrome''
* ''Literature/{{Coma}}''
* ''Film/TheConspiracy''
* ''Film/ConspiracyTheory''
* ''Film/TheConversation''
* ''Literature/TheDaVinciCode''
* ''VideoGame/DeusEx''
** ''VideoGame/DeusExHumanRevolution''
* ''Series/EdgeOfDarkness''
* ''Film/EnemyOfTheState''
* ''Literature/TheGenesisCode''
* ''Literature/GetBlank''
* ''HiddenAgenda''
* ''TheManchurianCandidate''
* ''Literature/MrBlank''
* ''Film/TheNet''
* ''Film/TheParallaxView''
* ''Series/PersonOfInterest''
* ''Literature/SevenDaysInMay''
* ''Film/ThreeDaysOfTheCondor''
* ''Series/{{Utopia}}''
* ''Film/WinterKills''
* ''Series/TheXFiles''
** ''Film/TheXFilesFightTheFuture''.
[[/index]]
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