Tristan, Katinka, Kirk, and Petra are four orphaned siblings who have found a new family with their former housekeeper, Miss Nelly, and her boyfriend Brian. Together they have built a loving home on Martinsvej, where the children look forward to Christmas. But their happiness is threatened when the dreaded Welfare Witch comes knocking: the grandparents have discovered their daughter is missing and demand custody of the children. With the law on their side, the battle seems lost. Yet the siblings refuse to give up and devise a daring plan that might just save both their family and Christmas.