Devil's Necklace by Kat Martin

To British privateer Ethan Sharpe, Grace Chastain is nothing but a pawn for vengeance against Harmon Jefferies, the traitor responsible for his brutal years in prison. Believing Grace to be Jefferies' mistress, he plans to humiliate his enemy by seducing her.

And when Captain Sharpe takes her prisoner aboard his schooner, Grace fears her priceless heirloom necklace has begun to live up to its curse Defiantly she resists the captain's coarse advances, but suspects there is more to this complex seafarer than his brooding anger and silent accusations.

Ethan quickly realises that Grace is not the wicked woman he imagined her to be–she is as headstrong as she is lovely, and the battle of wills that ensues weakens his resolve. Now Ethan must decide: can he settle the demons of his past and follow the destiny his heart commands?