Can two young women, and one book, change the course of war...? 1940. Whip-smart librarian Peggy Sparks is determined to make sure that her brother Joe returns from the frontline to their London home, which they share with their beloved mother and grandmother. So when she is offered a once-in-a-lifetime job at the heart of the war effort, Peggy jumps at the prospect of making a real contribution to her country. However, when she finds herself working under the fanciful socialite Lady Marigold Cecily, Peggy discovers that those around her are more keen on dancing at the Cafe de Paris than on ending the war. Writing accounts of her daily life is the only thing keeping Peggy's hopes alive. But when she finds her innermost thoughts accidentally published by the Ministry of Information, Peggy realises she needs Marigold's help to save her job, and to bring her brother home...