My Warrior by Glynnis Campbell

Fierce and fearless Sir Holden de Ware has been sent to Scotland to ally with the Gavin clan and secure the border—an easy conquest, he assumes, until he discovers that the impassioned warrior defending the castle is a woman. Fiery Cambria Gavin is not about to surrender her land. She blames Holden for her father’s death and—as proud and capable as any knight—she vows vengeance. But her sworn enemy proves gallant, courageous, and irresistible, and revenge becomes a double-edged sword as Cambria finds her blade…and her heart…hopelessly entangled with his.