Upon arriving at her grand estate, Lady Darriby-Jones finds it swarming with security forces, their presence a necessity to protect a royal dignitary from Eastern Europe. This mysterious guest, a young noble who recently lost a sibling to a brutal murder in London, is thrust into Lady Darriby-Jones's care for safekeeping. As she struggles to maintain the grace and order of her household amidst the disruption, Lady Darriby-Jones begins to unravel the tragic and lonely life of the royal guest, whose title conceals a world of misery. Despite her initial reluctance, her sense of justice compels her to promise that she will find the murderer responsible for the sibling's death.

However, the situation becomes even more perilous when one of the security officers is discovered dead within the estate's grounds. The scent of conspiracy is unmistakable, and Lady Darriby-Jones knows she must act swiftly. Determined to uncover the truth, she ventures into the shadowy corners of London, risking not only her own safety but the lives of those under her care.

But as she uncovers layers of deceit and treachery, she realizes she's dealing with a villain as cunning as they are dangerous. Can Lady Darriby-Jones outwit a murderous mastermind, or will her pursuit of justice put her—and her entire household—squarely in the crosshairs?