Lion’s Bride by Iris Johansen

The darkly handsome warrior found her in the hot desert night, the last survivor of a caravan devastated by a brutal attack. But Thea could hardly have found a less likely savior. Brooding and powerful, the infamous Lord Ware felt no need to rescue a total stranger, but Thea’s striking beauty and fighting spirit moved him. So the knight in tarnished armor carried her away to his secret stronghold at Dundragon, where she would become his prisoner, his tormentor, his lover . . . and the one weapon his deadly enemy could use to destroy him.