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He serves as a historical tour guide for the story. The police adamantly summons him to the crime scene to help them decipher clues left by the victim at the scene after misunderstanding one of the clues left behind by Sauniere. In this story, he happens to be in Paris when the curator of the Louvre museum is murdered. He seems to be an unintended main character in that the action and adventure of the plot find him, rather than him searching for it. Robert Langdon, Harvard professor of symbology and author of several books on religious symbolism and iconography, is the story’s protagonist. ‘ The Da Vinci Code‘ is the second of the Langdon series, so we get a protagonist whom Brown fans are already familiar with and meet new characters who present a broad spectrum of ideologies that motivate their actions.