Showing Witch Fire by Anya Bast

After a chaotic marriage and a rough divorce, all Mira Hoskins wants is stability and normality. But when sexy Jack McAllister enters her life, she discovers that what you want isn't always what you need.

Jack is a powerful witch with the ability to command fire and is anything but normal. As the head of a security detail for The Coven, a national organization that governs national witches, Jack has been assigned to watch over Mira. She is a natural born witch with the ability to call the air. And although she is unaware of her talent, a group of renegade witches has discovered her existence and are determined to steal her power--and her life.