robert langdon returns in dan brown's brilliant new thriller, the secret of secrets, available for pre-order now. discover the bestselling thriller of all time from global phenomenon dan brown. harvard professor robert langdon receives an urgent late-night phone call while on business in paris- the elderly curator of the louvre has been brutally murdered inside the museum. alongside the body, police have found a series of baffling codes. as langdon and a gifted french cryptologist, sophie neveu, begin to sort through the bizarre riddles, they are stunned to find a trail that leads to the works of leonardo da vinci - and suggests the answer to a mystery that stretches deep into the vault of history. unless langdon and neveu can decipher the labyrinthine code and quickly assemble the pieces of the puzzle, a stunning historical truth will be lost forever...