A late eighteenth century GothicNovel by Ann Radcliffe. The young heroine Emily St. Aubert's mother and father die, leaving her in possession of a mysterious family secret. After their death she is left in the care of her gold-digging aunt Madame Cheron, who marries the rich, malevolent MagnificentBastard Count Montoni. When Emily discovers that Count Montoni is not only a murderer but the leader of an entire bandit army, his castle begins to take on a sinister, almost supernatural presence. Emily spends much of the book panicking and waiting for her fiancÚ Valancourt to rescue her. In true Gothic romance fashion, duels, battles, and mysterious images and sounds out of nowhere abound.

While much parodied and lambasted for its extravagant, overdramatic writing style (see Jane Austen's ''Literature/NorthangerAbbey''), ''Mysteries of Udolpho'' remains one of the seminal works of Gothic literature and is the basis for nearly all Gothic fiction written afterwards.
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!!Tropes featured in ''Mysteries of Udolpho'' include:

* TheAloner: Emily for much/most of the book.
* AntiClimax: Seven hundred pages of buildup about what could be behind that sinister Black Veil, and it turns out to be a [[spoiler:hunk of painted wax]]. Surely that was a let-down even for innocent young ladies of RegencyEngland.
* AxeCrazy: Montoni. Good God, Montoni.
* BadassArmy: Count Montoni's mercenary army.
* TheBechdelTest: Actually scores pretty well in this regard. Emily and Annette talk more about the mysterious things scaring them in the castle and a possible escape than romance and Emily's later encounter with women has her less interested in discussing Valencourt and more interested in discovering her family history.
* BetaCouple: Annette and Ludovico
* BookWorm: Emily and her father.
* CulturedWarrior: Valancourt, Morano and Montoni. Radcliffe loves this trope.
* DeusExMachina: EVERYWHERE.
* EliteMooks: Montoni's higher-ranking bandits.
* {{Fainting}}: Emily. Let's just say it would ''very'' dangerous to make a DrinkingGame out of her fainting fits.
* GoldDigger: Madame Cheron. It doesn't work out too well.
* HeroicWannabe: Morano.
* ILied: Montoni after he extorts Emily's property away from her.
* IncorruptiblePurePureness: Emily
* TheIngenue: Emily again.
* LockedRoomMystery: Ludovico disappears from one.
* LoveAtFirstSight: Valencourt falls in love with Emily pretty much as soon as he meets her.
* LukeIAmYourFather
* MasculineGirlFeminineBoy: Emily is far more mature and sensible than the more emotion driven, potentially unstable Valencourt.
* MisanthropeSupreme: You guessed it... Montoni
* MysteriousProtector: Valancourt and Morano. Granted the first never actually seems to ''do'' much of anything...
* NaiveNewcomer: Emily, and Cheron
* OfficerAndAGentleman: Valancourt
* ParentalAbandonment: Both of Emily's parents die relatively early in the story, leaving her in the hands of her GoldDigger aunt and EvilUncle.
* PrideBeforeAFall: Count Montoni
* PrivateMilitaryContractors: Montoni's bandits double as mercenaries
* RichBitch: Madame Cheron and the Countess.
* ScoobyDooHoax: Started the trend of having the supernatural events in Gothic novels eventually turn out to have rational explanations, especially, as is the case here, humans using it to hide something.
* ScrewTheRulesIHaveMoney: Montoni
* SecretKeeper: Emily, Valancourt, and Montoni.
* ServileSnarker: Annette
* StalkerWithACrush: Morano
* StarCrossedLovers: Emily and Valancourt
* {{Ubermensch}}: Montoni
* WarIsHell
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