Cornwell’s book is in serious trouble these days. Ever since Rychlak published Hitler, the War, and the Pope (which included a detailed examination of Cornwell’s claims) and Rabbi Dalin’s The Myth of Hitler’s Pope came out, the table has been turned. The simple fact - an irrefutable fact too - is that all of the archives being opened, all of the original sources being published, vindicate Pius XII.
It is a safe bet though, that none of the Pius XII bashers on here own a single copy of it, let alone three.