On the day that Paris fell to the Nazis, R. G. Waldeck was checking into the swankiest hotel in Bucharest, the Athene Palace. A cosmopolitan center during the war, the hotel was populated by Italian and German oilmen hoping to secure new business opportunities in Romania, international spies cloaked in fake identities, and Nazi officers whom Waldeck discovered to be intelligent but utterly bloodless. A German Jew and a reporter for Newsweek, Waldeck became a close observer of the Nazi invasion. As King Carol first tried to placate the Nazis, then abdicated the throne in favor of his...