It Happened One Autumn by Lisa Kleypas

I think the hero in this book, Lord Westcliff, is this author's version of Mr. Darcy from "Pride & Predjudice". That being said, Lillian Bowman, the heroine, is no Elizabeth Bennett, and this is not just a re-tooling of that story. Lillian is the kind of woman that a woman would love for a friend - loyal, fun, shrewd, and made of pretty stern stuff. It was interesting to see Marcus & Lillian's relationship progress. Plus....the rogue that emerges in this story is such a classic character - the dashing, blonde, blue-eyed, charming, quick-witted, rakish Lord St. Vincent. I'm so glad she gave him his own book next, "Devil In Winter".