Set in post-World War I London, the story follows Verity Kent, a former Secret Service agent, as she navigates the complexities of her new life with her husband, Sidney. The couple becomes embroiled in a murder investigation when a friend is accused of killing her husband, a naval officer. As Verity delves deeper into the case, she uncovers a web of secrets and espionage that threatens to unravel the fragile peace they are trying to build. Balancing personal struggles with the lingering shadows of war, Verity must use her wit and skills to uncover the truth and protect those she loves.