A snowstorm delays Miss Mallard from joining Willard for a ski vacation at Mount Catastrophe in Switzerland. It is a delay that turns out to be a blessing for while riding the cable car up to the top, Miss Mallard witnesses a robbery. Following ski tracks in the fresh snow leads Willard and Miss Mallard deep into a mystery that is only solved when the owner of the Ace of Spades is found.

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.