The Deception (Baron #3)

Forced into spying on the Duke of Portsmouth when Napoleon's agents kidnap her father, a beautiful young woman poses as a widow to gain the Duke's trust. But she must be careful, for if the Duke were allowed to undo her defenses, her pretense of experience in marriage would be undone. And his persistent advances place her in an even more precarious position as she falls in love with him. Rated '3/5 - Open door' for steam/spice/heat level.