"Art historians agree that Da Vinci's paintings contain hidden levels of meaning that go well beneath the surface of the paint. Many scholars believe his work intentionally provides clues to a powerful secret... a secret that remains protected to this day by a clandestine brotherhood of which Da Vinci was a member."

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Coincidence was a concept he did not entirely trust. As someone who had spent his life exploring the hidden interconnectivity of disparate emblems and ideologies, Langdon viewed the world as a web of profoundly intertwined histories and events. The connections may be invisible, he often preached to his symbology classes at Harvard, but they are always there, buried just beneath the surface.

— Dan Brown