A sweeping, immersive epic story of love and war set in England in the first half of the 20th century. In the brief golden years of King Edward VII's reign, Rosie McCosh and her three sisters are growing up in an idyllic, eccentric household in the countryside, with their "pals" the Pitts boys on one side of the fence and the Pendennis boys on the other. But their days of childhood innocence and adventure are destined to be followed by the apocalypse of the First World War that will overwhelm them as they come to adulthood.