Harry, a fearless optimist, sets off on an epic journey - teaming up with rugged mountain man Louis and his loyal reindeer Liam - to find his brother Niall, whose icy powers have trapped the kingdom of Arendelle in eternal winter. Encountering Everest-like conditions, mystical trolls and a hilarious snowman named Michael, Harry and Louis battle the elements in a race to save the kingdom. From the outside Harry's brother, Niall looks poised, regal and reserved, but in reality, he lives in fear as he wrestles with a mighty secret-he was born with the power to create ice and snow. It's a beautiful ability, but also extremely dangerous. Haunted by the moment his magic nearly killed his younger brother, Harry, Niall has isolated himself. spending every waking minute trying to suppress his growing powers. His mounting emotions trigger the magic, accidentally setting off an eternal winter that he can't stop. He swears he's becoming a monster and that no one, not even his brother can help him.