El Codigo Da Vinci/The Da Vinci Code

When an elderly curator of the Louvre turns up murdered, his body surrounded by enigmatic ciphers written in invisible ink, code-breaker Robert Langdon and a French cryptologist are called in to unravel the clues to the killing, only to discover that the riddles are linked to the works of Leonardo da Vinci and to a clandestine, ruthless sect within the Catholic Church.