During World War I, a German spy and a French spy meet and fall in love.

Madeline Goddard is a smart young woman who owns a fashionable dress shop in neutral Sweden during WWI. Though she is grateful to avoid the fighting, the courageous and stunningly pretty Madeline feels she should be doing more for her native France. She volunteers to work as an intelligence agent, smuggling maps and other documents within the fashionable garments she ships to wealthy customers in London. Madeline's activities are so successful that British intelligence comes to rely on her as their main pipeline for information. At about this time, a British official in Sweden asks her to cultivate the friendship of Baron Karl Von Marwitz, a tall, distinguished-looking German officer who is in charge of counter-espionage activities at the German embassy. Unknown to Madeline, the baron has been sent to Sweden for the express purpose of discovering and eliminating the top British spy who has been smuggling out German war plans. When Madeline and Karl meet, each recognizes the other as a deadly foe, but a smoldering attraction seems to grow each time they see each other. Madeline is dazed by her conflicting feelings and attempts to run away; however Von Marwitz is able to board her ship on the high seas and capture her as a spy. Soon afterwards, his own ship is torpedoed by a British destroyer sent to rescue Madeline. The mortally wounded Baron Von Marwitz dies in her arms, confessing his love. Madeline is hailed as a hero but turns to look out to sea, shedding tears over her gallant German lover.—Dan1863Sickles

In 1918, Swiss national Madeleine Goddard is the proprietress of a high-end Stockholm dress shop, selling the latest Paris designs. With friends and acquaintances of all nationalities, she, like her own nationality, is neutral in matters of the Great War, despite seeing seemingly innocent people get hauled away by one side or the other. She meets ladies' man Baron Karl Von Marwitz, who only arrived in town having left the German military due to injuries sustained in the war, although many of his German colleagues believe that he's a deserter. Despite his playboy ways, he pursues Madeleine and falls for her, and while she rebuffs his initial advances, believing she would only be the latest woman in his arms before he moves on, she in turn starts to fall for him. Their relationship has the potential to cause problems for their true professional lives as both are really undercover spies, Madeleine who is able to go undetected in smuggling information through her trade as she makes her trips to and from Paris to purchase items for the shop. The question then becomes how being spies, regardless of which side either represents, will affect their relationship as they truly do fall in love with each other, being on opposing sides which could complicate matters even more in captured spies having been executed.—Huggo