In 1920, Louisa Cannon is en route to a new job—and hopefully a new life—as a nursery maid for the aristocratic Mitford family when an altercation lands her in the clutches of the London, Brighton and South Coast Railway Police. When the policemen are called away to investigate the on-train murder of veteran combat nurse Florence Nightingale Shore, Louisa hopes she's home free. But Louisa's eldest charge in the Mitfords' bustling household, sixteen-year-old Nancy, has a nose for trouble, and the unlikely duo soon find themselves enmeshed in the Shore murder investigation. Intrigue, betrayal, love, friendship, and plenty of drama fill this charming historical mystery, set against the glittering backdrop of post-World War I England and delightfully peopled by the childhood versions of the soon-to-be-famous Mitford sisters.