Fire and Ice — Shannon Hale

Strange things are happening at the frozen edge of the world. Conor, Abeke, Meilin, and Rollan have crisscrossed Erdas in their quest to stop the ruthless Conquerors. Only the four of them, supported by the gifts of their legendary spirit animals, have the power to defeat an evil takeover.

While chasing down a lead in the cold North, the heroes arrive at a quiet village where not everything is as it seems. Rooting the truth out of this deceptively beautiful place won't be easy-and the team is already out of time.

The Conquerors are right behind them.