In a well-documented and balanced book, Professor David Alvarez offers a history of Papacy and intelligence, from Napoleon to the Second World War. Religioscope has asked him a few questions.
Books by Prof. David Alvarez on spionage and the Vatican:
Spies in the Vatican: Espionage & Intrigue from Napoleon to the Holocaust, Lawrence: University Press of Kansas, 2002 (342 p.)
Nothing Sacred: Nazi Espionage Against the Vatican, 1939-1945 (with Robert A. Graham), London / Portland: Frank Cass, 1997 (XIV+190 p.)