The Mitford Murders (м) Fellowes

It's 1919, and Louisa Cannon dreams of escaping her life of poverty in London, and most of all her oppressive and dangerous uncle. Louisa's salvation is a position within the Mitford household at Asthall Manor, in the Oxfordshire countryside. There she will become nurserymaid, chaperone and confidante to the Mitford sisters, especially sixteen-year-old Nancy - an acerbic, bright young woman in love with stories. But when a nurse - Florence Nightingale Shore, goddaughter of her famous namesake - is killed on a train in broad daylight, Nancy and amateur sleuth Louisa find that in postwar England, everyone has something to hide . . .