Pre-World War II espionage and love story: Doug Whittiker, a sophisticated young man, has been appointed Director of Advertising and Publicity for the posh Fifth Avenue, New York Hotel Savoy, owned by his uncle and mentor, notorious oil magnate Henry L. Stoddard, the richest man in the United States. Doug soon discovers that among the wartime refugee escapees from Europe flooding New York City, the hotel is harboring Nazi and Fascist guests, Axis employees, and tempting Mata Hari honeypots. Doug also uncovers a sinister plot between his uncle’s business associates and a group that is seeking to secure a huge shipment of desperately needed oil for Adolf Hitler. Reporting his troubling findings to the FBI and Army Intelligence, Doug agrees to unofficially spy on behalf of the United States. At the same time, Doug has fallen madly in love with popular headliner at the hotel’s Café Savoy, beautiful French chanteuse Marceline Mercier (Marcy), who is deeply concerned for the safety of her father who lives in Paris, soon to come under Nazi occupation. Doug's relationship with Marcy intensifies, as he gathers evidence against Axis operators and works to thwart the nefarious oil deal.