Cryptographers Grail Appreciation Art museum curators Crimes against Manuscripts Secret societies Mystery and detective stories Computer security Fiction Freemasonry Intelligence officers Papacy Americans--Arctic regions--Fiction Computer Security--Fiction Computer security--Fiction Conspiracies--Fiction Cryptographers--Fiction Intelligence Officer--Fiction Langdon, Robert (Fictitious character) Leonardo, da Vinci Leonardo, da Vinci, 1452-1519 Leonardo, da Vinci, 1452-1519--Manuscripts--Fiction Meteors--Fiction Mystery Papacy--Vatican City--Fiction Presidents--Election--Fiction Scientists--Fiction United States, National Security Agency--Fiction Vatican City--Fiction