

When these are lined up correctly, they unlock the device. In the safe deposit box they find the keystone: a cryptex, a cylindrical, hand-held vault with five concentric, rotating dials labeled with letters. Neveu and Langdon escape from the police and visit the bank. However, she understands that her grandfather intended Langdon to decipher the code, which she and Langdon find leads them to a safe deposit box at the Paris branch of the Depository Bank of Zurich.


Neveu is troubled by memories of her grandfather’s involvement in a secret pagan group. A police cryptographer, Sophie Neveu, secretly explains to Langdon that she is Saunière’s estranged granddaughter, and that Fache thinks Langdon is the murderer, because her grandfather’s message said “PS Find Robert Langdon”, which she says Fache had erased prior to Langdon’s arrival.
