Oh my goodness, I did enjoy this one. And it stuck with me for a few days because of the level of details and authenticity. It's September 1939. A handful of women librarians who call themselves the Secret Society of Librarians are gathered in an attic flat in Bloomsbury, in London's West End, for their annual weekend of gin and grumbling about their male bosses. Then the radio announces that Britain is at war. Before the night is out, they've made a vow: if people can't get to the books, we take books to the people. The book follows two of these women. Joyce is a mousy, rule-following library assistant in Camden, London. Dorotha, their founder, is home in Łódź, Poland, where the war has already reached her. Soon she's trapped behind barbed wire in the Łódź ghetto. I loved the mobile library. Joyce has wanted a library on wheels for years, and her boss calls it ridiculous. Then the Blitz starts, the boss runs off to the countryside, and Joyce ends up with a secondhand six-wheeled black Ford "behemoth" with mahogany shelves and room for two thousand books. Joyce can't drive it. But Dorotha's teenaged sister Adela, a Jewish refugee who learned to drive farm trucks back in Poland, can. They name the van Nan, after a tough old woman they meet in a bomb shelter. At the launch, a newspaperman sneers about "women drivers and a van full of bodice-rippers." They take it out anyway, to air-raid wardens, to Tube shelters, and to a barrage balloon crew of women (they operated and maintained large, hydrogen-filled balloons tethered by steel cables to defend vital targets against low-flying enemy aircraft) who can't get enough whodunnits. (One volunteer quietly asks Joyce to reserve her a copy of Lady Chatterley's Lover. I laughed out loud.) The Blitz. Wow. It's vivid, and it doesn't hold back. A library's glass ceiling explodes, and the ash of thousands of burned books swirls through the air like a snow globe. Joyce spends nights wedged on a stopped escalator at Liverpool Street station. She reads The Secret Garden aloud in a street shelter while the bombs fall, providing small moments of relief to citizens as they huddled in an effort to avoid the bombs.