The Clandestine Queen — Brandon J. Greer

For twenty years, Loravain, a slave to a demon bent on world domination, has dreamed of winning his freedom. To do so, he has become the demon's assassin, hunting down witches and other creatures. Finally, the day comes when the demon offers it if he completes one task. Kill a young witch who will one day be his downfall. Maggie is an orphan who doesn't know who she is or where she comes from. The only thing she does know is that she isn't like the others in her village. When a hidden letter, written before her birth by her mother, turns up, she is called home to take her rightful place as queen of the witches. Setting off on the adventure of a lifetime, Maggie hopes to learn who she is and what she can do, if she lives long enough.