Upon the death of her father, Mary Bennet's life is thrown into turmoil. With no fortune or marriage prospects, she must rely on the kindness of her relatives. When a mysterious late-night visit by an unknown relative—a Lady Trafford from Castle Durrington—leads to an extended stay and the chance for an education, Mary gratefully accepts the opportunity. But even as she arrives at the castle, she's faced with one mystery after another. Who is Lady Trafford really, and what is she hiding? Do her secrets and manipulations place the small seaside community at risk of an invasion by Napoleon Bonaparte? Always curious, Mary sets out to discover the answers. But when she finds the dead body of a would-be thief she outed prior to her father's funeral, she jeopardizes her position at the castle and her family's good name in her quest for the truth.