London, 1918: with men out fighting on the front, women work in their stead, enjoying newfound freedom. That’s just how one woman likes it best: Stella Benson, writer and friend to Virginia Woolf. But in wartime, money grows scarce and stomachs empty, while news of the conflict provide little cheer. So, to escape from the oppressiveness of an uncertain future, Stella starts writing the story of Sarah Brown, a woman her age living a dull life as a secretary in the English administration, until she meets Miss Watkins—a witch who flies by night on her broomstick to keep bombs from falling on London!