Sophie Neveu is a fictional character from Dan Brown's novel, The Da Vinci Code. She is a French cryptologist who plays a crucial role in unraveling the mystery surrounding the murder of Jacques Saunière, the curator of the Louvre Museum. In the story, Sophie teams up with Robert Langdon, a Harvard symbologist, to decode a series of puzzles and symbols. Her expertise in cryptography and her personal connection to the case make her an essential character in the quest for truth and understanding of historical secrets.