To Seduce an Angel — Kate Moore

They are the "Sons of Sin" -- three, brothers whose mother is an infamous London courtesan. Though Xander, Will, and Kit may not be legitimate in the eyes of the aristocracy, their mother made sure that they each received a gentlemen's education and knew how to make their way in the world...

The youngest of the Jones brothers, Kit, has just been made the Marquess of Daventry -- heir to his vengeful grandfather, the Duke of Wenlocke. As Daventry, Kit is a warrior angel trapped in a gilded cage who wants to free his family with a decisive defeat of the old duke. In a daring move that breaks all the rules of his well-guarded life, he hires the beautiful Emma Portland to tutor his young wards while he makes his plans.

But everything about Emma is a lie. Alone, pursued by enemies from her past, and falsely accused of a murder she didn't commit, Emma must spy against Daventry for his grandfather. For if she doesn't play by the duke's rules, she'll hang. So Emma passes herself off as a tutor as she plans her escape. What she doesn't plan on is falling in love with the man she's been sent to destroy...