When an elderly curator of the Louvre is murdered, his body surrounded by enigmatic ciphers written in invisible ink, Robert Langdon and a French cyptologist 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, in a new illustrated edition of the blockbuster best-seller. 300,000 first printing.