Illusions of Betrayal by JT Marie

Sheila was once heir to the throne of Khaal. But in her thirteenth year, the court's wizard slew her parents and assumed command of the castle. Sheila had seen Faelyn's treachery with her own eyes -- she'd seen him twist the life from her mother before running into the night, leaving her own best friend Rane to his dark mercy.

In the gutters of the city, she takes up with Teague, a street magician and the legendary leader of the resistance against the crown. Against Faelyn. For ten long years, she learns the tricks of his trade, learns to fight beside him, and when the time is ready, she stands with him to take back what's rightfully hers.

But the wizard she finds in the castle's parapet isn't who she expects.