The Frozen Curse by Jacob North (Hardcover)

The Frozen Curse is the second book in Jacob North's action-packed Ice Apprentices middle grade fantasy series. Oswin begins his second year at the school for Ice Apprentices in Tundra just as the Great Freeze threatens. Masters are vanishing and trees with strange faces seem to attack. When Oswin fails a test and is expelled, he sets out on a dangerous journey to uncover the truth before everyone freezes.