Based on a true story. Set in London, 1944: 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 theatre—offering shelter, solace, and escape from the bombs that fall upon their city.