The Cry of the Icemark (Electronic book text)

When her father dies nobly in battle, fourteen-year-old Thirrin becomes Queen of the Icemark, a tiny kingdom for ever caught between dangerous neighbours. Thirrin must raise an army to protect her people from seemingly invincible Imperial invaders. Her search for allies takes her beyond her northern borders, to former enemies in the Land-of-the-Ghosts and onwards to the frozen Hub of the World. But can she save her kingdom?