Tempting Fate by Nora Roberts

Caine MacGregor has yet to be impressed by Diana Blade. She's the sister of the man who is about to marry Caine's sister but she sure doesn't act like it. Gorgeous, but cold, she acts nothing like anyone he's ever known.
Diana is nervous. She hasn't seen her brother since they were children. The aunt who raised her has her convinced that he is close to the devil himself. Not that her aunt was the best but Diana is still cautious, everyone in her life has left. And she knows Caine's reputation. Just a few years behind him at law school, she knows the swath he cut through not only the classes but the female students. But she's moving to be closer to her brother as she opens up her own law office and Caine has the space. But the more he gets to know Diana, the deeper he finds that she hides her feelings and he'll have to work to get her to admit that she might have feelings too.

Four Stars
This book came out May 1st, 1985

Follows Playing the Odds

Followed by All the Possibilities
Book borrowed from Library
Opinions are my own