The study follows relationships between Czechoslovakia and Holy See during the pontificate of Pius XII. It initially emphasises, that in the time he took the office Vatican diplomacy no longer negotiated with the communist régime on the basis purely theoretical, but rather of wide and painful experience.
During the Second World War and imminently after it therefore watched rising influence of the Soviet Union in eastern, central and southern Europe with concerns. From these concerns origin the uncompromising posture of Pius XII against Czechoslovakian communists.
The study follows it mainly through the pope’s speeches and texts, which are in the contemporary historiography unjustly neglected.