Amanda Hocking - Frostfire [Kindle azw3]

Hidden deep in the heart of a snow-covered wilderness lies the secret kingdom of the Kanin—a magical realm as beautiful as it is treacherous...
Bryn Aven has never fit into Kanin society. Her blond hair and blue eyes set her apart as an outsider—a half-blood unable to hold a respectable rank. But she's determined to prove herself as a loyal protector of the kingdom she loves. Her dream is to become a member of the King's elite guard, and she's not going to let anything stand in her way...not even her growing feelings for her boss, Ridley Dresden. A relationship between them is strictly forbidden, but Bryn can't fight her attraction to him. And she's beginning to think he feels it too. Meanwhile, there's an attack on the kingdom—one that will test Bryn's strength like never before.