"The Da Vinci Code" is a mystery thriller novel written by Dan Brown. It follows the story of Robert Langdon, a symbologist, who is called to the Louvre Museum in Paris after the murder of its curator, Jacques Saunière. Langdon teams up with cryptologist Sophie Neveu to unravel a series of clues hidden in famous artworks, leading them on a quest to uncover a secret that could change history. The novel explores themes of religion, art, and history, particularly focusing on the relationship between Mary Magdalene and Jesus Christ. It raises questions about the interpretation of religious texts and the role of secret societies, such as the Priory of Sion and the Opus Dei.