Brown, Dan Inferno : a novel / Dan Brown. - New York : Doubleday, 2014. - xi, 611 p. ; 19 cm. - [Robert Langdon novels], [4] . ISBN: 978-1-4000-7915-5 Subjects--Personal Names: Dante Alighieri, 1265-1321. Subjects--Topical Terms: Langdon, Robert (Fictitious character)--FictionCryptographers--Fiction