Author Dan Brown discusses Inferno, the latest film to be based on one of his novels. He talks about how fortunate he's been to work with Ron Howard, the years of research it took to write Inferno, and the great international cast that brings the story to life. He chats about Florence, Italy, where much of the film unfolds, and praises Tom Hanks, whom he calls "intelligent, curious and self-educating" and "perfect" for the role of Robert Langdon.