Lily Dickinson's discovery of a dead gamekeeper in a cottage near a country lane leads to a search for his killer. Suspects range from employees of the nearby Grangehurst estate to a number of dangerous characters much closer to home. Before Lily can face the murderer, she needs to enlist the aid of her younger sister Iris. But with Lily still refusing to share the secret of the trunk in the attic, will Iris be willing to help when Lily needs her most?