Firebinders: Marek. The Firebinders Series, #1

A firebinder. A scientist. A blood that heals. A blood that kills. A supernatural mortal in search of his kind. A woman in danger of losing her life and her heart. Marek Bannach, a firebinder, has been searching for the rest of his kind - mortals with the gift of fire in their blood - before they are killed off by someone only known as The Shadow. Accepting his friend's help of a meeting with a powerful witch in New Orleans, his thoughts of self-preservation are derailed when he rescues a woman who stirs his blood, not realizing that she has something he needs.
Gwen Fraser never expected a man with the deepest blue green eyes to keep rescuing her from continuing threats on her life. He intrigues her and sets her heart racing. Escaping those who want to harm her because of her research, she agrees to go to New Orleans with him. En route, he gives her an unguarded moment of pleasure, not realizing that he has something she wants. Thrown together by circumstances dictated by serendipity, they succumb to the passion that engulfs them even if only for a few days.
But danger isn't far behind and Gwen's life is under threat once more. Now that he has found the woman the universe has decreed to be his, Marek must keep her safe at all cost. For all the fire in his blood will mean nothing without her.