english: The novel introduces the character Robert Langdon, who is also the protagonist of Brown's subsequent 2003 novel, The Da Vinci Code, 2009 novel, The Lost Symbol and 2013 novel Inferno.
non_english: Novel ini ngnalkno karakter Robert Langdon, paraga protagonis saka lanjutan novel, Brown 2003 The Da Vinci Code, lan 2009 novel, The Lost Symbol .