In post-World War II England, a clever, young woman named Mary Adams finds herself thrust into a world of privilege and secrets as she transitions from being a wartime factory worker to a maid in the grand estates. In a stately ancestral home, a brewing family feud takes a deadly turn when a murder attempt on the heir, a young bachelor, goes awry. As tensions run high, Mary must navigate a treacherous landscape of family deception to unmask the killer before they can strike again….