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 (film series):  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). Dan Brown: 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).
Inferno