Do a Google search on this man, Fr. Pierre Blet, S.J. and buy his books. He's one of the world's biggest fans of Pius XII. He's a historian, a famous Church historian. Born in France he entered the Jesuits in 1938. He was an eyewitness to history and has spent a lifetime teaching, reading and writing. After years in the Vatican archives he as a story to tell. Read his books. (N.B. And he celebrates his private Mass according to the usus antiquior each afternoon).