Mists of Tiarnas (Beguiled West Series I: Book 2)

Cait finds herself suddenly moved with her soul mate to the mystical island of Tiarnas, a supernatural island that appears only once every seven years. Under the guise of imperial protection, she is now an honored guest of King Torlach, the God-King of the Supernatural Realm, the Otherworld and Underworld, Continuum, Parallel Timelines, and the Immortal Neiamhala. One of the six original gods created before the beginning of time, Torlach reigns above all around him except for one...
Cait. Gradually falling under the hypnotic spell of Tiarnas, she discovers her true nature and of those around her...before it is too late.