Healing the Tormented Highlander by Lydia Kendall

Her secret led her to him, only to take her further away…
Ceana Morvell sees her quiet life as a healer collapse, in the blink of an eye.
At the sight of her parent’s desecrated graves, her heart breaks in two. Handed a key by her grandmother and bid to protect it at all costs, she is forced to flee under the cover of night.
Raghnall MacCramhain, Laird of Mhaol Chaluim, struggles to protect his territory from English attacks. When a stunning but secretive healer appears at his doorstep, he finds it hard to focus on anything but her.
Unable to resist their passion, the couple surrenders to their overpowering desire. But as their bond strengthens, Ceana’s presence attracts unwanted attention…
When a hooded figure attacks Ceana and leads her to a secret place, she is given one sole choice: surrender the key or watch her grandmother perish. As she gazes upon a face she knows all too well, realization dawns: not only her time with Raghnall is over but she has also just stepped into the lion’s den.