[[caption-width-right:300:''[[TagLine The only thing more terrifying than searching for The Devil...is finding him.]]'']]
''The Ninth Gate'' is a 1999 mystery thriller film by Creator/RomanPolanski, freely adapted from ''Literature/TheClubDumas'' by Arturo Pérez-Reverte, starring Creator/JohnnyDepp as Dean Corso, an expert on rare books. A client, Boris Balkan, played by Creator/FrankLangella, asks Corso to authenticate his copy of ''The Nine Gates of the Kingdom of Shadows''. The book has three copies surviving, due to the rest being burned in 1666 along with its author - because the book is supposedly an adaptation of another book, the ''Delomelanicon'', written by Lucifer himself.

As Corso attempts to figure out which of the three copies is the genuine one, he discovers that the ''Nine Gates'' has a purpose - when used correctly, the book will raise the Devil himself and grant the summoner great supernatural power. Corso is not the only person who has figured this out, and is chased by others who want the power and protected by a mysterious [[NoNameGiven Girl]], played by [[Film/{{Frantic}} Emmanuelle Seigner]]. The deeper Corso delves into the mystery of the book, the deeper the pile of bodies left behind becomes.

That, of course, is the movie. In the book, Corso has two missions. One is to try and authenticate his client, Vara Borja's, copy of "The Nine Gates of the Kingdom of Shadows." The other involves "The Anjou Wine", a chapter of the original manuscript of ''Literature/TheThreeMusketeers'' by Creator/AlexandreDumas, père. This manuscript was once owned by the late Enrique Talliefer, a millionaire who specialized in cookbooks, who killed himself. While traveling around Europe on his mission(s), he finds himself being stalked by a man and woman who look uncannily like Milady de Winter and Comte de Rochefort.

What do these two strangers want with him and what is the connection between Literature/TheThreeMusketeers and the Devil?

!!This film provides examples of:

* AdaptationalAttractiveness: Corso, in the book described as rather unattractive, is played by Johnny Depp.
* AdaptationDistillation: The movie removes several subplots from the novel, combines numerous characters and changes the ending. It still works quite well though.
* AdaptationNameChange: Lucas Corso of the book becomes Dean Corso. Liana Taillefer becomes Liana Telfer. Her henchman, mainly called Rochefort in the book before his name is revealed, goes unnamed.
* AncientConspiracy: The Order of the Silver Serpent probably like to think of themselves as this.
* BloodyHandprint: The Girl, after rescuing Corso, leaves this upon Corso's face (in the eerie shape of a trident) after wiping her nose and stares at Corso. He is [[BloodSplatteredInnocents visibly shaken after this]] and demands to know what's going on.
* {{Catchphrase}}: In the movie, when Corso tries to corner the Girl, she often answers "If you say so."
* CompositeCharacter: [[spoiler: The film's Balkan is a composite of the book Balkan and another character, Varo Borja. Also, the film's Andrew Telfer is a composite of Enrique Talliefer and Gualterio Terral.]]
* CulturalTranslation
* DealWithTheDevil: The goal of most characters in the film is to summon Lucifer and obtain unknown power. This seems to eventually happen in some capacity and, depending on your point of view, has surprisingly little negative consequence. [[spoiler: Just a few dead bodies, really, including a pseudo-friend. But hey, you get laid by attractive women. Twice!]]
** It was also the goal of Aristide Torchia, who published in 1666 "''De Umbrarum Regni Novem Portis'' ''[[labelnote:Lat.]]The Nine Doors to the Kingdom of Shadows [[/labelnote]]''" which he based on the "''Delomelanicon'' ''[[labelnote:Lat.]]Invocation of Darkness [[/labelnote]]''", a work supposedly written by Lucifer and allowing the reader to summon Him.
* DeathByAdaptation: [[spoiler: Bernie the bookshop owner is killed early on. His book counterpart, Flavio la Ponte, is a major supporting character and stays very much alive. Also Liana Telfer, her henchman, and Boris Balkan, although [[CompositeCharacter it's not really the same character as in the book.]]]]
* EveryoneLovesBlondes: Corso's infatuation with The Girl, who is a tall foreign woman with long blonde hair and striking green eyes (which tend to glow from time to time)... And who can blame him?
* EverybodySmokes: And they do it everywhere, as there is not a "No Smoking" sign in sight.
* FadeToWhite: The ending.
* FanDisservice: The Girl's [[spoiler: face morphing disturbingly several times before revealing herself to be The Devil during sex with Corso outside the burning castle]].
* ForbiddenFruit
* GlowingEyes: The Girl's eyes noticeably glow on several occasions. [[spoiler: Given that she is quite possibly the Devil, or at least ''a'' devil, this may count as GlowingEyesOfDoom]]
* GreenEyes: Corso remarks on the Girl's green eyes, and even calls her "Green Eyes" when she neglects to give her name to him
* HiddenInPlainSight: The last of the engravings in "The Ninth Gate" is hidden in what, in hindsight, is an extremely obvious spot. "If this is a forgery or a copy with missing pages restored, it's the work of a master," says the master bookbinder.
* HotAsHell: [[spoiler: The Girl, who makes the Devil look GOOD. Doubtless intentional.]]
* ImpoverishedPatrician: Both Victor Fargas, the Portuguese owner of the second copy, and [[spoiler: Liana Telfer, who had to marry Andrew Telfer in order to save her ruined French aristocrat family.]]
* LouisCypher: Signed [[FunWithAcronyms LCF]].
* MercyKill: After [[spoiler: Balkan's]] {{deal with the Devil}} [[GoneHorriblyWrong goes horribly wrong]] and he catches on fire, burning to death, Corso shoots him to put him out of his misery.
* MindScrew: The ending. [[spoiler:Apparently Corso is going to conduct the ritual himself and it'll be a success, but it's ambiguous as to what that means. Not to mention all the speculation about exactly who Corso and the Girl are.]]
* MarkOfTheBeast: When making out with Corso, Liana Telfer is shown to have this tattooed on her thigh in [[SnakesAreSinister the form of a serpent]].
* NoNameGiven: The Girl.
* NumberOfTheBeast: Balkan has the largest collection in the world of books about the Devil. Guess what the password to his library is? Also, the author of the book he's seeking, who supposedly summoned the Devil, published it and was burned along with all of his works, except for three books, in 1''666''.
* PowerFloats: [[spoiler: The Girl]] saving Corso from his attackers.
* ProductPlacement: Several examples, but most notably when Corso is getting gas, he deliberately twists the nozzle so the Shell logo directly faces the camera.
* RaceLift: Rochefort, an EeriePaleSkinnedBrunette in the book, becomes a bleach blond black man. With NoNameGiven.
* TheReasonYouSuckSpeech: Balkan gives one [[spoiler: to Liana and her followers.]]
-->'''Balkan:''' As for you, [[spoiler:Liana de Saint-Damien]], you're even guiltier than the rest of this pathetic rabble. You have at least some idea of what this book can do in the right hands, yet you lend yourself to these farcical proceedings, these orgies of aging flesh conducted in the Master's name. You're a charlatan!
* ShownTheirWork: The Ceniza Brothers tell Corso that forging or restoring an antique book is so difficult and costly it wouldn't be profitable. Even with modern technology, forging old books well enough to fool the types of collectors and historians who will be interested in buying them is rather expensive, taking a lot of time and resources including the proper paper and ink and a ''very'' good eye for detail. But even if you pull off a passable forgery of a rare book, it's probable you'll be found out anyway because those kinds of books are going to have their owner histories known by collectors, and questions will be asked about how you acquired your copy.
* SidekickExMachina: The Girl, who is always there just in time to extricate or save Corso.
* StartsWithASuicide: The film begins with Andrew Telfer hanging himself in his library.
* TarotMotifs: The film includes many examples of Tarot imagery.
** The Hanged Man - Corso's friend is killed in this manner.
** The Tower - [[spoiler: Balkan's]] death occurs by fire, in a tower, after a lot of pride.
** The Magician - Boris Balkan.
** The High Priestess - Baroness Kessler or Liana Telfer.
** The Empress - Liana Telfer.
** Death - Fargas.
** The Hermit - Fargas.
** The Fool - Corso.
* TitleDrop: Even though "''The Nine Gates etc...''" are often referred to, you need to wait for the end, to hear Balkan mention "unlocking ''Film/{{The Ninth Gate}}''" during his ceremony.
* UglyGuyHotWife: One case being the deceased elderly Andrew Telfer and his young, beautiful widow, Liana Telfer.
* UnusualEuphemism: At one point, Liana tells Corso "Don't fuck with me!," to which he responds, "I thought I just did." The TV Edit changes "fuck" to "mess" making Corso's response unintentionally bizarre.