Wolf's Lady - Magic & Mechanicals, #1

The only mistake Lady Adelle Thornber ever made turned into a scandal that rocked London and saw her banished to Scotland, the reluctant bride of a reclusive baron. But Lord Henry MacAulay isn't what she was expecting: he cares deeply for his barony and for her. As the sole heir to the Roseheath title and werewolf alpha, Henry knew that he had to take a mate someday. He just didn't expect to find her in a disgraced noble's daughter forced into marriage with him.  As he falls more deeply in love with Adelle, he can't bring himself to tell her what he really is.
But if he doesn't, it may not be his werewolf nature that could tear them apart.