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Robert Langdon, a Harvard symbolist, is urgently invited to give a lecture at the Capitol Building in Washington, DC. But instead of a sophisticated audience, the professor finds five mysterious symbols tattooed on the severed arm of his mentor, the Freemason Peter Solomon. Langdon finds himself at the centre of events behind the scenes of one of the most influential cities in America. Everything that seemed familiar has turned into a shadowy secret world in which Masonic secrets and hitherto unknown revelations seem to lead to one extraordinary and impossible truth. Sometimes you just need to change your angle to see the light.