[PAR] [TLE] Dan Brown [SEP] Daniel Gerhard "Dan" Brown (born June 22, 1964) is an American author of thriller fiction, most notably the novels "Angels & Demons" (2000), "The Da Vinci Code" (2003), and "Inferno" (2013).  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.  Three of them, "Angels & Demons" (2000), "The Da Vinci Code" (2003), and "Inferno" (2013), have been adapted into films. [PAR] [TLE] Robert Langdon (film series) [SEP] The Robert Langdon films are a series of American mystery thriller movies directed by Ron Howard.  The films focus on the eponymous professor, a fictional character appearing in a series of novels by author Dan Brown.  The film series has a different chronological order than the novels, and consists of "The Da Vinci Code" (2006), "Angels & Demons" (2009) and "Inferno" (2016).  The series has grossed almost $1.5 billion worldwide.
[PAR] [TLE] Dan Brown [ SEP ] Daniel Gerhard " Dan " Brown ( born June 22 , 1964 ) is an American author of thriller fiction , most notably the novels " Angels & Demons " ( 2000 ) , " The Da Vinci Code " ( 2003 ) , and " Inferno " ( 2013 ) . 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 . Three of them , " Angels & Demons " ( 2000 ) , " The Da Vinci Code " ( 2003 ) , and " Inferno " ( 2013 ) , have been adapted into films . [PAR] [TLE] Robert Langdon ( film series ) [ SEP ] The Robert Langdon films are a series of American mystery thriller movies directed by Ron Howard . The films focus on the eponymous professor , a fictional character appearing in a series of novels by author Dan Brown . The film series has a different chronological order than the novels , and consists of " The Da Vinci Code " ( 2006 ) , " Angels & Demons " ( 2009 ) and " Inferno " ( 2016 ) . The series has grossed almost $ 1.5 billion worldwide .
Robert Langdon's films based on Dan Brown's novels were released in a different chronological order than the novels, though the last movies released was also the last book released. Which book was it?
Robert Langdon 's films based on Dan Brown 's novels were released in a different chronological order than the novels , though the last movies released was also the last book released . Which book was it ?
Inferno
Inferno