When Harvard symbologist Robert Langdon is called to The Louvre on account of Jacques Sauniere's death, he is greeted by a carefully placed arrangement of clues the curator all so strategically left behind. One clue was an anagrammed grouping of the Fibonacci sequence. At first glance the structure seems like randomly strewn numbers, but Langdon knows that Sauniere is a smart man, and that they must mean something. Before he can possibly make any sense of it, Agent Sophie Neveu from the DCPJ's Cryptology Department arrives to break the code. While at the museum she reveals privately to Langdon that they are both in great danger. The Judicial Police think that Langdon has killed Sauniere - Sophie's grandfather.

It was not by accident that Sophie was called to the scene. That was Sauniere's intention. She spent her entire childhood living with her grandfather, and she understands that the...