The Crescent and the Ash Queen - The Transcendents, #1

A deadly assassin seeking freedom. A manipulative queen seeking power. A depraved court hanging in the balance. Zavala Nightingale is a deadly assassin with a slick mouth, and devastating magic. Even though she's the most feared Crescent in the Bones Court, she still wants out. Zavala has one more job to finish, then she'll collect her coin and leave.But the Ash Queen has other plans for her. When the Ash Queen declares Zavala as her heir, and the next Crescent Queen, Zavala will be faced with one of two choices:Accept and be a Crescent for life, or deny the Ash Queen, drawing the wrath of every assassin alive.
For fans of angels, assassins, and powerful magic.