When Aurelia, Lady Farnham, receives a package from an acquaintance of her late husband, her well-ordered life dissipates. The letter reveals that her husband did not perish in battle three years ago, but that he died just weeks ago. The missive discloses his reasoning and he appeals to Aurelia to help Colonel Sir Greville Falconer, his fellow spy. After she absorbs the impact of her husband's lies and his choices, Aurelia accedes to his wishes and introduces the colonel to society. Never in a million years did Aurelia believe that working with the colonel would feed an unknown fire within her that revels as she works to uncover Spanish spies.

Colonel Greville Falconer returns to London to ferret out a Spanish network that has infiltrated London society. Greville is skilled in his work and excels at devious plotting and maneuvering during the long war. His latest assignment promises new experiences. His isolation, which has served him well, is threatened when he establishes a partnership with Aurelia. When events spiral out of control, Greville marries Aurelia for protection. The hunter has now become the hunted.

Aurelia thrives in the excitement flowing in her veins from spying. With Greville at her side, she discovers new aspects to herself and feelings emerge for Greville. As they navigate treacherous emotions, Greville loses his famous detachment. How much that will hinder him, he does not know, until a kidnapping makes him evaluate his beliefs.

Ms. Feather creates a woman's fascinating journey from a comfortable lady in society to a competent spy while balancing her daughter's safety. Complimenting the transformation is Greville learning to embrace emotion and family. Using the Napoleonic era as backdrop, the suspense builds into the startling climax that highlights Amelia and Greville's growth.