Dan Brown is an American author of thriller fiction who is best known for the 2003 bestselling novel The Da Vinci Code. Brown's novels are treasure hunts set in a 24-hour period, and feature the recurring themes of cryptography, keys, symbols, codes, and conspiracy theories. His books have been translated into 52 languages, and as of 2012, sold over 200 million copies. Four of them, Angels & Demons (2000), The Da Vinci Code (2003), The Lost Symbol (2009) and Inferno (2013), have been/are being adapted into films.