Revered by millions, the Papacy is an international power that many nations have viewed with suspicion, some have tried to control, and not a few have spied upon. Ranging across two centuries of world history, David Alvarez's fascinating study throws open the Vatican's doors to reveal the startling but little-known world of espionage in one of the most sacred places on earth. Reviewing the pontificates of ten popes--from Pius VII, Napoleon's...