If the end of the war was supposed to have brought `freedom` to countries that suffered under Nazi occupation, then for millions it did not really end until the fall of Communism. In the summer of 1945 many of the countries in Eastern Europe simply swapped the rule of one tyrant, Adolf Hitler, for that of another: Joseph Stalin. Why this happened has remained one of the most troubling questions of the entire conflict, and is at the heart of Laurence Rees` dramatic book.