Someday My Duke Will Come by Christina Britton

A fake engagement becomes the real thing in this historical romance.

Lady Clara Ashford had no intention of ever getting married. A rogue took advantage of her innocence when she was young, and she’s spent her whole life trying to make sure no one finds out. But now that her sister is engaged, Clara’s well-meaning aunt has set her sights on Clara. Desperate to avoid the matchmaking schemes, Clara’s not sure what to do — until her neighbor, the new Duke of Reigate, shows up on her doorstep in need of her help.
Quincy Nesbitt reluctantly accepted the dukedom after his brother’s death, but he’ll be damned if he accepts his brother’s fiancée as well. The only polite way to decline is to become engaged to someone else — quickly. Lady Clara has the right connections and happens to need him as much as he needs her. But he soon discovers she’s also witty and selfless, and if he’s not careful, he just might lose his heart.