The Forbidden - Dark Sorcery, #1

D'Anu witch Silver Ashcroft walks a perilous line by practicing gray magic-but she must protect herself and the ones she loves at all costs. Silver witnesses evil beyond comprehension, and knows it's up to her, alone. That is, until she meets Hawk. Hawk is a Tuatha D'Danann warrior, one of the powerful beings descended from the Fae. In his world, duty has always come before pleasure. When he meets Silver, the lines blur and the sensual witch might be too much of a distraction from the terrors that lie in wait. Only the strongest will survive the upcoming battle in San Francisco.
The forces of darkness have become more powerful than ever. Warrior and witch must trust in their hearts above all else-for to claim victory, they must first claim each other.