Is Santa Clausduck real? For Miss Mallard, everyone must make their own decision, and a mystery in Sweden's Lapland allows everyone to do just that. Someone is scaring away the elves and reindeer from a tourist attraction Santa's workshop. But is it just a tourist attraction or could this be the new home of the real Santa Clausduck? Christmas legends and myths from different countries blend together to help Miss Mallard and Willard solve a mystery that puts Christmas itself at risk.

圣诞老人夫妇在北极的家被探险家发现，为逃避旅游者和记者的骚扰他们搬到了瑞典的拉普兰。圣诞将至，驯鹿和小精灵却不见了。圣诞老人夫妇只能向他们多年的老朋友梅小姐求援。大家都说是讨厌圣诞老人的圣诞守护鸭汤姆赶走了驯鹿和小精灵。圣诞老人不断继续遭到恐吓，梅小姐和维乐的侦察不断受到阻挠。一定有个精通机械原理又不懂得摄影知识的家伙在搞破坏。一封神秘的信告诉梅小姐一个更紧急的情况：驯鹿和小精灵们藏身在冰坑里，而有关当局正要炸平那冰坑。爆破在即，梅小姐、维乐解救了被困的驯鹿和小精灵。原来那个凶恶的守护鸭是坏蛋假扮的，一切都是为了行业竞争。危机过去了，圣诞老人又驾着他的雪橇去为孩子们送礼物去了。而维乐也知道了一个天大的秘密——这个世界上真的有圣诞老人。