On a dark night at the Louvre Museum, curator Jacques Saunière is brutally murdered. Before dying, he leaves a series of clues in the form of symbols and codes. Robert Langdon, a renowned Harvard symbologist, is unexpectedly called in to help with the investigation. However, he soon learns that Saunière held a monumental secret related to the history of Christianity.
Accompanied by Sophie Neveu, a brilliant cryptographer and the murdered man's granddaughter, Langdon embarks on a thrilling quest through the labyrinths of the Louvre and other historical sites across Europe. As they decipher the enigmas left by Saunière, they become entangled in a web of conspiracies that includes the mysterious secret society of the Priory of Sion and the sinister Catholic Church, willing to do anything to protect its legacy.
With each clue uncovered, the tension escalates, and the discovery of a secret hidden for centuries could change the world's perception of religion. Langdon and Sophie must be cunning and quick, as they are not only seeking answers but their own survival. As they unravel the truth, a cataclysmic game of betrayals, secrets, and revelations leads them to question everything they have ever believed. The line between good and evil blurs in a race against time to reveal a mystery that could rewrite history as we know it.