Shadow Of The Dragon by Kyra Dune

Micayta’s world has long been gripped in the thrall of an endless winter that grows worse with the passing of time. Life is a constant struggle. Then catastrophe strikes the small town in which she lives, thrusting Micayta and her brother Pytaki alone into the snow laden countryside. To keep herself and her brother alive will take all the strength that she has.
Then a mysterious stranger appears to complicate matters. Tech has an amazing story to tell, but is any of it true? Old wounds and betrayals make Micayta slow to trust, but without Tech she and her brother will never make it across the countryside alive. Through bandits, wolves, and snowstorms, the three struggle their way to the city of Phadra. But the real danger lies within the city walls, where Micayta becomes a player in a deadly game with a dark-eyed mage.
Nothing is what it seems.
As the truth unravels, Micayta finds herself drawn into a struggle much bigger than she ever dreamed. Choices must be made and sides taken. But the question of who to trust is one not easily answered. Micayta will have to open her heart and find a way to let someone else in, or the flames that destroyed her home will consume the world.