The New York Times
VATICAN CITY — David Kertzer put down his cappuccino, put on his backpack and went digging for more Vatican secrets. “There’s an aspect of treasure-hunting,” said Kertzer, a 74-year-old historian. Sign up for The Morning newsletter from the New York Times Moments later, he cut through a crowd lined up to see Pope Francis, showed his credentials to the Swiss Guard and entered the archives of the former headquarters for the Holy Roman Inquisition. Over the last few decades, Kertzer has turned the