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 work through the bizarre riddle, they are stunned to find a trail that leads back to the works of Leonardo Da Vinci - and suggests the answer to a mystery that stretches deep into the vault of history.