So half of the questions I ask are totally irrelevant to the book, just to keep people guessing.

WSJ: Dan Brown returns to Europe for 'Inferno'

I'm constantly trying to keep people guessing as to what I'm doing.

WSJ: Dan Brown's Secret to Keeping Secrets

"I'm always trying to keep people guessing, " Brown says.

WSJ: Dan Brown returns to Europe for 'Inferno'