Robert Langdon, Harvard professor of symbolism and religious iconology, is coming to Bilbao's Guggenheim Museum to participate in the presentation of a discovery that will "change the sciences forever." The event will be hosted by Langdon's friend and former student Edmond Kirsch, a forty-year-old tech mogul. , whose dazzling inventions and bold predictions have made him a controversial figure around the world, tonight is no exception: he claims to be announcing a startling breakthrough with far-reaching consequences.

But to the dismay of Langdon and the hundreds of guests, the event comes to a tragic end before it can even begin. Langdon is forced to flee in desperation with the museum's director, Ambra Vidal. They escape to Barcelona and embark on a dangerous quest for a password that unlocks Kirsch's secret.

Langdon and Vidal must find their way through the city's labyrinthine passageways against an enemy that is one step ahead of them at every turn. The trail they follow is marked only by cryptic symbols and ambiguous modern works, but Langdon and Vidal unravel the clues one by one and finally come face to face with a world-shattering truth that has remained hidden - until now.

Dan Brown is the author of The Da Vinci Code, one of the most read books of all time. He also wrote three other bestsellers, the protagonist of which is Robert Langdon, a Harvard symbologist: Inferno, The Lost Symbol, Angels and Demons. Two of his other thrillers were also international successes: The Degree of Deception and Digital Fortress.