England, 1920. Widowed and world-weary, Lady Gayle Summer inherits the brooding Bethencourt Castle after her father’s sudden death. Determined to leave her flapper days behind, she dons the mantle of lady of the manor—only to be greeted by gunfire after the funeral.

When her friend Lady Sylvia vanishes during a quiet afternoon ride, and the horse returns without her, Gayle’s new life turns from dull to deadly. Who killed Sylvia? Was Gayle the true target? And what secrets lie hidden in the castle’s shadowy attics?

With the help of her sharp-eyed maid, Alice, Gayle delves into dusty trunks, unearths half-eaten meals, and uncovers long-buried legal papers that reveal a chilling motive. She’ll need all her courage—and a keen intellect—to unmask a killer before she becomes the next victim.