Not Quite A Gentleman by Jacquie D'Alessandro

Nathan Oliver, younger son of an earl, is content being a country doctor. Years ago he had worked for the Crown, but when a spy mission went awry, he left London for a simpler life. Now his world is turned upside down with the arrival of Lady Victoria Wexhall, a pampered Society miss more suited for the ballrooms of London than the quiet countryside of Cornwall.

Victoria cannot believe her father would send her to the middle of nowhere, and just when the the Season was in full swing! And with Nathan Oliver, no less! Of course, he's dashing and more interesting than the fops she's acquainted with in Town, and it would be so easy to fall in love with him. But why does he insist on searching through her luggage in the middle of the night? And why does he insist their lives are in danger?