My Shadow Warrior (MacDonell Brides, #3)

Rose, the youngest of the MacDonell sisters, is more concerned with her father's mysterious illness than with her impending marriage to her childhood sweetheart. A gifted but frustrated healer, she decides to beg help from William MacKay -- a reclusive laird who is renowned not only for his ferocity, but also for his healing powers. Denied entry to his fortress in the cold, harsh mountains of the far northwestern highlands, Rose uses cunning to force her way in, and William is duly intrigued with this bold slip of a girl. But securing his help may not be enough to save Rose's father. For there is something darker at work in the glen, something more powerful than William's and Rose's magic combined, and only the soul-deep passion that shadows their mutual desire can help their love prevail.