Way up north in Greenland lives 12-year-old Lucia with her mother and her father, who is best known as Father Christmas. Lucia is the first girl ever in Santa class at the international Christmas School. On the day that the present machine is supposed to be started for this year’s present production, Lucia’s best friend, the reindeer herder Oscar, is accused of stealing King Winter’s magical crystal that fuels the present machine. Claudia, Lucia’s mother who has long been wary of the crude Oscar, tries to prevent Lucia from ruining her future career by defending the seemingly guilty boy. But Lucia is determined to fight injustice and escapes with Oscar to prove his innocence by finding the real thief..