Don't doubt the Dan Brown juggernaut. By 2003's The Da Vinci Code, Brown had clearly honed his pop-lit formulation of improbable plot twists, historical trivia and travelogue. While travelers may have bought more copies of Angels and Demons, The Da Vinci Code started the phenomenon. Harvard professor Robert Langdon's quest for the Holy Grail might rely on some shaky historical theories, but with The Da Vinci Code, Brown indisputably found publishing's commercial equivalent.
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