Lord of Dunkeathe by Margaret Moore

The Lord of Dunkeathe had strength and cunning, and with a wife who brought him power and wealth, he would soon be the envy of all. But though countless eager young women paraded before him, vying for his favor, it was the sharp-tongued, quick-witted, and completely unsuitable Lady Riona who drew him as no other.
Lady Riona knew full well the arrogant knight would never choose an impoverished Scottish bride, but the Norman devil’s heated glances held such promise that even she was ready to swoon at his feet. Lord help her, but Nicholas had her ready to trade her long-protected virtue for the promise of one night of passion in his arms!