About the book

Inferno is a 2013 mystery thriller novel by American author Dan Brown and the fourth book in his Robert Langdon series, following Angels & Demons, The Da Vinci Code and The Lost Symbol. The book was published on May 14, 2013, ten years after publication of The Da Vinci Code (2003), by Doubleday. It was number one on the New York Times Best Seller list for hardcover fiction and Combined Print & E-book fiction for the first eleven weeks of its release, and also remained on the list of E-book fiction for the first seventeen weeks of its release. A film adaptation was released in the United States on October 28, 2016.

Important character

Robert Langdon: An American professor of symbology at Harvard University, Cambridge, Massachusetts and protogonist of the novel.

Sienna Brooks: A doctor and Zobrist’s former lover who works for The Consortium and secondary antogonist. She helps Langdon find the virus Zobrist created, but her past relationship with Zobrist makes her loyalty to Langdon suspicious until the end of the novel. She was a loyal disciple of Zobrist until she reads his last letter and decides to get his new technology before it can fall into the wrong hands. She believes the World Health Organization will cooperate with other government agencies to use Zobrist’s new virus for weapons. She uses The Consortium and Langdon to follow the Map of Hell and get to ground zero before everyone else, but realizes that Zobrist had set off a futile search as he released his virus well beforehand.

Bertrand Zobrist: A transhumanist genius scientist who is obsessed with Dante’s Inferno and a primary antagonist of the novel. He is intent on solving the world’s overpopulation problem by releasing a virus.

Elizabeth Sinskey: The head of the World Health Organization who hires Langdon to find Zobrist’s virus. She became infertile after taking steroids to help with her childhood asthma attacks and as such is emotionally invested in Zobrist’s method of controlling world population.

Cristoph Brüder: Head of the SRS team (part of the European Centre for Disease Prevention and Control) who is ordered by Sinskey to find Langdon after she loses contact with him.

The Provost: The head of The Consortium. He tries to bring to fruition Zobrist’s wishes by securing the location of the virus from Langdon and Sinskey and scheduling to release to the media a video Zobrist made before his death. When he learns that he was helping Zobrist in a bio-terrorist attack, he helps the World Health Organization to search for the weapon. He is eventually arrested for his part in the events.

Vayentha: The Consortium’s agent in Florence who has orders to follow Langdon but is later disavowed after failing her mission. She falls to her death after a confrontation with Langdon and Brooks in the Palazzo Vecchio.

Jonathan Ferris: An agent of The Consortium who pretends to be in league with the World Health Organization. He used fake eyebrows and a mustache to act as Dr. Marconi in the beginning of the novel.

Marta Alvarez: An employee at the Palazzo Vecchio in Florence who assists Langdon with Dante’s death mask. She is pregnant with her first child.

Ignazio Busoni: The obese director of Il Duomo in Florence, nicknamed “il Duomino”, who assists Langdon with Dante’s death mask. He succumbs to a heart attack prior to the events of the novel.

Ettore Vio: The curator of St. Mark’s basilica in Venice.

Mirsat: A tour guide of Hagia Sophia in Istanbul.

Story plot

Harvard symbolism professor Robert Langdon wakes up in a hospital in Florence, Italy with a head wound and no memory of the last few days. Dr. Sienna Brooks, one of the doctors tending to him, reveals that he is suffering from amnesia. When Vayentha, an assassin, shows up in the hospital and kills one of the doctors, while attempting to kill Langdon, Brooks helps Langdon escape, and they flee to her apartment.

Langdon finds a cylinder with a biohazard sign in his jacket and decides to call the U.S. consulate. He learns that they are searching for him, but, prompted by Brooks, claims to be across the street from her apartment, to avoid getting her more involved. Soon, Langdon sees Vayentha pull up to the location he gave the consulate, deducing that the U.S. government wants to kill him. Langdon opens the container and finds a small medieval bone cylinder fitted with a hi-tech projector that displays a modified version of Botticelli’s Map of Hell, which is based on Dante’s Inferno. A trail of clues leads them toward the Old City.

He goes there with Brooks, but they find that a secretive team of soldiers, and the Florentine Carabinieri searching for them. They flee, and Langdon examines the “Map of Hell” again, noticing several changes to the layers. Langdon discovers a phrase from the painting The Battle of Marciano by Vasari, located in the Palazzo Vecchio. They manage to evade the soldiers and get into the Old City using the Vasari Corridor.

At the Palazzo, Langdon meets the director of the museum, Marta Alvarez, who recognizes him, having met him and Ignazio Busoni, the director of Il Duomo, the previous night, when she showed them Dante’s death mask. Langdon asks to see the mask again, to retrace his steps, but they find the mask gone, and security footage shows Langdon and Busoni stealing the mask. Fleeing, Langdon and Sienna listen to a message left by Busoni, referring to “Paradise 25”.Vayentha murderes Ferris with the squib breaking his ribs.

Langdon and Brooks escape the guards, but the soldiers arrive, and chase them across the attic. Vayentha also arrives, and in a confrontation with Langdon, Brooks pushes her to her death. Langdon connects the phrase “Paradise 25” to the Florence Baptistry, where they find the Dante mask along with a riddle from its current owner, a billionaire geneticist named Bertrand Zobrist. Brooks explains that Zobrist was a geneticist who advocated the halting of humanity’s growth, and that he was rumored to be working on an engineered disease to do so. Ferris, claiming to be from the World Health Organization (WHO), helps them escape the soldiers. Ferris had been ordered to detain Brooks. They follow the riddle to Venice. Ferris collapse was due to Brooks punching him in his damaged ribs, with Brooks claiming he is suffering from massive internal bleeding, causing Langdon to suspect Ferris has been infected with Zobrist’s plague. Langdon is captured by a group of soldiers while Brooks escapes.

Langdon is taken to Dr. Elizabeth Sinskey, the director-general of the WHO. She explains that Zobrist, who committed suicide the week before, had supposedly developed a new biological plague that will cause infertility in a third of the worlds’ population, in order to solve the problem of the world’s impending overpopulation, citing the Doomsday Argument. Sinskey raided Zobrist’s safe deposit box, found the cylinder and flew Langdon to Florence to follow the clues. However, he stopped communicating with Sinskey after meeting with Alvarez and Ignazio and the WHO feared he betrayed them and was working with Zobrist. The soldiers were the WHO’s emergency response team, and not meant to kill him.

Zobrist had paid a shadowy consulting group “The Consortium” to protect the cylinder until a certain date. He also left a video filled with disturbing Dante imagery, and then showed a picture of the plague itself, kept in a hidden underwater location, within a slowly dissolving bag. The video claims that the world will be changed the following morning. When Sinskey retrieved it, the Consortium abducted Langdon and staged every event up to this point, to motivate him to solve it.

Brooks goes rogue and The Consortium realizes she was a secret supporter and lover of Zobrist. She learned where the plague was being kept after Langdon solved the riddle and acquires a private jet to get to it. Langdon, the WHO and The Consortium team up to stop her. After watching Zobrist’s video, they conclude that the bag containing the plague will be fully dissolved by the date the video specifies and that Zobrist’s clues point to its location: the Hagia Sophia in Istanbul. They find the plague is in the Cistern but discover Brooks already there. The bag that held the plague had already been broken, presumably spreading to the outer world via visiting tourists. Brooks runs out of the Cistern, causing panicked tourists to stampede, while Langdon gives chase.

Despite almost escaping, Brooks returns, and reveals that the bag had already dissolved one week earlier. The date specified in Zobrist’s video was the mathematical calculation of when the entire world would be infected, which has already happened. The plague that Zobrist created is revealed to be a vector virus that randomly activates to employ DNA modification to cause sterility in one third of humans. Brooks reveals that she was trying to stop the virus herself, distrusting the WHO, fearing the virus would be weaponized if they found it. The leader of The Consortium tries to escape WHO custody, but is caught later. Brooks receives amnesty in exchange for working with the WHO to address the crisis, since she has extensive knowledge of Zobrist’s research and work

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