Feehan, Christine - Dark Challenge (Dark Series #5)

Dark Challenge (Dark Series #5) by Christine Feehan

From the Publisher:

Julian Savage was golden. Powerful. But tormented. For the brooding hunter walked alone, always alone, far from his Carpathian kind, alien to even his twin. Like his name, his existence was savage. Until he met the woman he was sworn to protect . . . When Julian heard Desari sing, rainbows swamped his starving senses. Emotions bombarded his hardened heart. Was Desari more than his perfect mate? Julian had met his match in this woman, but would she drive him to madness . . . or save his soul?