The conspiracy thriller (or paranoid thriller) is a subgenre of thriller fiction.
A common theme in such works is that characters discovering a secretive conspiracy may be unable to tell what is true about the conspiracy, or even what is real: rumors, lies, propaganda, and counter-propaganda build upon one another until what is conspiracy and what is coincidence becomes an undecidable question. The protagonists of conspiracy thrillers are often journalists or amateur investigators who find themselves (often inadvertently) pulling on a small thread which unravels a vast conspiracy that ultimately goes "all the way to the top". See Conspiracy fiction
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