The Awakening (Immortals #3)

Created at the dawn of time to protect humanity, the ancient warriors have been nearly forgotten, though magic lives on--in vampires, werewolves, the Celtic Sidhe, and other beings. But now one of their own has turned rogue, and the world is again in desperate need of the IMMORTALS

She came to him in a dream: her creamy skin delectably cool, silky raven hair smelling of the sea and ocean-blue eyes reflecting the depths of her passion. She was everything Kalen had been desperate to capture in his art--and in his bed. In reality, when Christine found his remote Scottish castle, it was to persuade the Immortal warrior to help repel the darkness spreading around the world. But Kalen had a vindictive Sidhe trying to steal his powers and a dark secret of his own to battle before he and Christine could give in to...THE AWAKENING