 Austria, 1818: Disaffected orphan Marcus is recruited by his pastor, Father Joseph Mohr, to evict mice from their church organ. But the boy s efforts to preserve the rodent family s home leads to the instrument s destruction. Determined to bring home a replacement choir piece in time for Christmas Eve, Marcus navigates a crippling snowstorm, a saboteur owl, and his own lack of faith in order to earn redemption. With the help of Mozart (his faithful rodent pal), Ed (a moose who dreams he s a reindeer), and Ol  St. Nikolaus himself, Marcus discovers his true faith delivering home the classic carol Silent Night: a belief in himself that was hiding in his heart all along.