Fire Prince: Fire & Reign, Book 2

"Myah has been betrayed. Nordlin City lie in flame, destroyed by the Osten Army, and her greatest nightmare has become her greatest sorrow. To avoid capture, Myah has no choice but to trust the master of the Osten Elite Guard to protect her and keep her out of the hands of her enemy and his people. However, trust is a fragile thing, easily fractured when her companion keeps his secrets as close as his steel, and Garrett’s reputation is not one that is easily dismissed. Garrett’s secrets have kept him and those he loves safe for years. To reveal one is to unravel them all, and the fire-haired girl of the north has a way of plucking at those threads. A promise is a promise, though, and he gave his word to see her safely to the resistance leader hiding at the edges of Morgensol, the southern kingdom. But as she has put her trust him, he knows that he will have to do the same if he wants to regain the most precious thing he has lost in the kingdom wars" -- Back cover