Captive: The Forbidden Side of Nightshade (Unabridged‪)‬

Sworn enemies are plunged into a steamy, forbidden romance in the first book of a new series that explore the darker side of the richly imagined world of Nightshade
 
Twenty-five-year-old Tristan Doran is a direct descendant of the Keepers—witches who have embraced dark magic. Deferring only to his overlord, Lord Bosque Mar, Tristan enjoys incredible power and privilege. For most of his life, he has been kept largely out of the centuries-old Witches War. But then Sarah, a beautiful young human Searcher, is captured and imprisoned in his castle. Blinded by their passion, captive and captor give in to their desires—only to learn that their love is at the heart of a prophecy predicting the downfall of the Keepers’ ages-old reign.