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" Katherine stopped abruptly and looked at Langdon. “Robert, Melencolia I is here in Washington. It hangs in the National Gallery.”
“Yes,” he said with a smile, “and something tells me that’s not a coincidence. The gallery is closed at this hour, but I know the curator and—”
“Forget it, Robert, I know what happens when you go to museums.” Katherine headed off into a nearby alcove, where she saw a desk with a computer.
Langdon followed, looking unhappy. "
― Dan Brown , The Lost Symbol (Robert Langdon, #3)