Edie Burchill receives a long lost letter and finds herself at Milderhurst Castle, where the Blythe spinsters live and where her mother was billeted 50 years before as a child during WW II. The Blythe sisters have spent their lives looking after their youngest sister who hasn't been the same since her fianceé jilted her in 1941. There, Edie begins to unravel her mother's past. But there are other secrets hidden in the stones of Milderhurst.