english: The novel introduces the character Robert Langdon, who is also the protagonist of Brown’s subsequent 2003 novel, The Da Vinci Code, and 2009 novel,The Lost Symbol.
non_english: Novèl ini ngnalkno karakter Robert Langdon, paraga protagonis saka lanjutan novèl, Brown 2003 The Da Vinci Code, lan 2009 novèl, The Lost Symbol.