American Journalist Josephine Marlowe knows firsthand the horrors of war - the bombs, the senseless slaughter when Warsaw fell to the Nazis. Now assigned to the Paris AP office, Josie sees the impending danger. Spies have already infilitrated the countries of Belgium and Holland and stand ready to assist with the invasion. As French civilians are evacuated from the countryside to Paris and the cadets at the Ecole de Cavalerie prepare for war, French colonel Andre Chardon heads a top-secret project. It could turn the tide of the war... but will the discovery be too late?