"The Da Vinci Code" is a mystery thriller novel written by Dan Brown. It follows symbologist Robert Langdon as he investigates a murder in the Louvre Museum in Paris. The story intertwines art, history, and religion, leading Langdon and cryptologist Sophie Neveu on a quest to uncover secrets hidden in famous works, including those by Leonardo da Vinci. The plot revolves around the idea that historical truths have been concealed by powerful organizations, particularly the Catholic Church. As Langdon and Neveu decode clues, they confront various challenges and adversaries, ultimately exploring themes of faith, knowledge, and the nature of truth.