Everything a Lady is Not (Bow Street Beaus #1)
Sawyer North

All Henry Beaumont wants is to prove himself to Society and step outside of his half-brother’s shadow. So when the duchess asks him for a personal favor involving her newly found granddaughter—with a hefty thank you reward at the end—he leaps at the opportunity.
It seems as if Lucy is trading one prison for another. Henry has now become a permanent fixture as her charming yet iron-fisted taskmaster and tutor in the ways of High Society. Like oil and water, Lucy and Henry spar in an epic battle of wills—and even rapiers. But Lucy’s past and her surprising, undeniable feelings for Henry may doom their undertaking if he declares his love for her...because without a title, he can never be hers.