Clara Button is no ordinary librarian. While war ravages the city above her, Clara has risked everything she holds dear to turn the Bethnal Green tube station into the country’s only underground library. Down here, a secret community thrives with thousands of bunk beds, a nursery, a café, and a theater—offering shelter, solace, and escape from the bombs that fall upon their city. Along with her glamorous best friend and assistant Ruby Munroe, Clara ensures the library is the beating heart of life underground. As the war drags on, the women's determination is tested to the limits.

London, 2017: When Aurelia Leclaire inherits an opulent Paris apartment, she is shocked to discover her grandmother’s hidden secrets - including a treasure trove of famous art and couture gowns. One obscure painting leads her to Gabriel Seymour, a highly respected art restorer with his own mysterious past. Together they attempt to uncover the truths concealed within the apartment’s walls.

An orphan who spent her youth without a true home, Marion Hoxton found in the Great War something other than destruction. She discovered a chance to belong. As a member of the Women’s Royal Naval Service—the Wrens—Marion gained sisters. She found purpose in her work as a motorcycle dispatch rider assigned to train and deliver carrier pigeons to the front line. And despite the constant threat of danger, she and her childhood friend Eddie began to dream of a future together. Until the battle that changed everything.

When the new deputy librarian, Juliet Lansdown, finds that Bethnal Green Library isn’t the bustling hub she is expecting, she becomes determined to breathe life back into it. But can she show the men in charge that a woman is up to the task of running the library, especially when a confrontation with her past threatens to derail her?

London, 1940. Emmeline Lake is Doing Her Bit for the war effort, volunteering as a telephone operator with the Auxiliary Fire Services. When Emmy sees an advertisement for a job at the London Evening Chronicle, her dreams of becoming a Lady War Correspondent suddenly seem achievable. But the job turns out to be working as a typist for the fierce and renowned advice columnist Henrietta Bird. Emmy is disappointed but gamely bucks up and buckles down.