The Cloud Kingdom by Kristen Painter

Queen Sparrow’s goal of reuniting the Radiant fae with the Grym fae isn’t going the way she’d hoped. Brokering peace is hard to do when Queen Anyka, the woman who sits on the Grym throne, believes both kingdoms should be hers to rule.
Ro isn’t about to let that happen. Since recovering an ancient grimoire filled with dangerous dark magic, she understands better who and what she’s up against. Anyka craves possession of the grimoire and Ro knows why. Anyka wants to use the magic inside to take control of Ro’s kingdom. And eliminate Ro.
Ro seeks the help and possible alliance with the fire-breathing citizens of the Cloud Kingdom, but they might be as dangerous as the book she’d hidden from Anyka. If she can win them over, it would be a major victory.

The real question is can she get to the Cloud Kingdom alive? Someone is out to get her. And it might not be Anyka..