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 nursery maid, chaperone and confidante to the Mitford sisters, especially sixteen-year-old Nancy – an acerbic, bright young woman in love with stories.But then a nurse – Florence Nightingale Shore, goddaughter of her famous namesake – is killed on a train in broad daylight, and Louisa and Nancy find themselves entangled in the crimes of a murderer who will do anything to hide their secret . . .