This is probably in the category of mailing coals to Newcastle, but here are some possibly pertinent notes:
Peter Hoffmann's "History of the German Resistance" documents Father Leiber's role and some other interesting
BF Smith and E. Agarossi on "Operation Sunrise" updates Allen Dulles own account. This event has already inspired
some "fiction": T. Wiseman -- Day Before Sunrise.
Anthony Cave Brown (Bodyguard of Lies) also makes a number of references to Vatican roles, and is fairly meticulous about
P.S. I told you I was a WW2 history buff!
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Brown has also edited a belated (and surely incomplete) "Secret War Report of the OSS" (Berkley Medallions paperback)
Its chapter on the Italian Resistance may have some interest.
The possible role of the Vatican in Badoglio's accession ('43) and in Kesselring's withdrawal from Rome and open-city
declaration (June '44) has, since the events, intrigued me -- and is conspicuously unmentioned in the histories I know.
How are you going to follow a spy in the Vatican during W.W.2 without getting into some very contentious history?