In 1940 London, ambitious librarian Peggy Sparks seizes a chance to aid the war effort, only to find herself working under the glamorous but frivolous Lady Marigold Cecily. While Peggy longs to bring her brother safely home from the front, Marigold seems more interested in late nights at the Café de Paris. But when Peggy’s private writings are mistakenly published by the Ministry of Information, the two women must join forces to protect Peggy’s future—and discover how courage, friendship, and the power of words might change the course of war.