The Club Dumas

Lucas Corso is a middle-aged book dealer with a reputation of doing anything—regardless of legality—for his privileged clientele. While in Madrid attempting to authenticate a previously unknown partial draft of The Three Musketeers, he is summoned to Toledo by Varo Borja, a notoriously eccentric and wealthy collector.

Borja has obtained a copy of a legendary book, Of the Nine Doors of the Kingdom of Shadows, whose author was burned at the stake by the Inquisition. The book purportedly contains instructions for summoning the Devil. Only one copy of the book is supposed to have survived, but Borja claims three exist, two of which are elaborate forgeries. He hires Corso to compare the three copies and obtain the legitimate one by any means necessary. He promises to pay handsomely and cover all expenses.

Corso agrees, but continues to research the partial Dumas draft. The widow of the draft's previous owner, Liana Taillefer, insists the draft is a fake, but offers to buy it from Corso. After several encounters, she attempts to seduce Corso to obtain the draft; when he succumbs to her charms but refuses to surrender the manuscript, she becomes his enemy. She imagines herself as Milady de Winter, and uses a male associate (whom Corso nicknames "Rochefort") to follow Corso and attempt to retrieve the manuscript by force.

Corso confers with the Ceniza Brothers, book restoration experts with extensive knowledge of forgery. They give him basic knowledge to help him compare the copies of The Nine Doors.

On his way to Lisbon to visit the owner of one of the copies, he encounters a beautiful blonde with striking green eyes. She identifies herself as "Irene Adler", and suggests that she is a fallen angel. They part company before he meets with Victor Fargas. Fargas is a renowned collector who has been selling off his extensive library to maintain his ancestral mansion. Corso compares Fargas' copy of The Nine Doors to Borja's, and finds subtle differences in the illustration plates. Most bear the initials of the book's notorious author, but some of the plates bear the initials "L.F."

As Corso returns to his hotel, "Irene" guards Corso against an attack by "Rochefort". Corso leaves her to arrange a robbery of Fargas' mansion to obtain his copy of the book. "Irene" informs him that Fargas has been murdered and his copy has been burned. She and Corso leave for Paris.

Corso confers with Replinger, an antiquarian and Dumas scholar, who authenticates the Dumas manuscript. As they talk, Corso spies Liana. He returns to his hotel and bribes the concierge to locate her hotel. "Irene" visits him, and they discuss theology; she implies that she is a witness to the events of the War in Heaven.

Corso visits Baroness Ungern, whose charitable institution possesses the largest occult collection in Europe, including the third copy of The Nine Doors. They discuss the book's author, before Corso blackmails her with photo evidence of her Nazi sympathies so she will let him examine her copy. "Irene" calls to warn Corso that "Rochefort" is waiting outside. The Baroness translates the illustration captions while Corso compares Ungern's copy to Borja's.

Later, Corso realizes that, while none of the three sets match each other, the plates bearing the initials "L.F." form a complete set of nine without duplications, and realizes the nine illustrations form a list of instructions for the famed summoning ritual. "Rochefort" attacks again, and is again repelled by "Irene".

Using the concierge's information, Corso confronts Liana and her associate, but "Rochefort" renders him unconscious. When he revives, Borja's copy and the Dumas manuscript are gone. He learns that the Baroness has been killed in a fire at her library.

Using Liana's obsession with Milady de Winter, he traces her to Meung, where he is captured by "Rochefort". "Rochefort" is instructed by a man calling himself "Richelieu" to bring Corso to a nearby castle. "Richelieu" introduces him to the Club Dumas, a literary society of wealthy Dumas enthusiasts, who are gathered for their annual banquet. Corso is astonished to find that they only want to see the Dumas manuscript, and know nothing about The Nine Doors. He is invited to stay for the party, but chooses to leave.

Corso returns to Spain to confront Borja. "Irene" insists that she is a fallen angel who has wandered the earth for millennia searching for him. Corso does not question this, and finds himself even more strongly attracted to her. He accuses Borja of being responsible for both murders. Borja, intending to use the ritual described by the book's true nine plates to summon the Devil and gain ultimate knowledge, has destroyed his entire library to prevent others from following his lead. Corso demands payment, but Borja ignores him and begins the ritual. Corso leaves in disgust; as he leaves, he hears Borja's screams of anguish as the ritual goes awry, remembering the Ceniza Brothers' discourse on false books and realizing one of the plates is a forgery. He joins "Irene" outside, and surmises that each of them will get the devil they deserve.

The Club Dumas references many books. Several of the references are not to a work itself, but to a singular instance of the physical book, such as a rare edition or type of binding. Several of these books are inventions of Perez-Reverte.

Roman Polanski's film The Ninth Gate (1999) was adapted from Pérez-Reverte's novel. While following the same basic plotline for the first two-thirds of the film, the finale is greatly altered in the movie. Several characters' roles diminish, expand, merge, swap or disappear completely, and one of the novel's most important subplots – the Dumas connection – is removed entirely.

In 1998, The Club Dumas was nominated for the Anthony Award for Best Novel, the Macavity Award for Best Novel, and the World Fantasy Award for Best Novel.