Santa Claus is suffering from a mysterious illness. He lies in bed and repeats only one word: Lebanna. The elves are desperate and do not know what to do. Christmas seems lost, when Annabel, Santa’s assistant, resorts to magic and summons the greatest detective on earth to the castle. The man who appears in front of her doesn’t seem very smart but claims to be the great-great grandson of the famous Sherlock Holmes. Annabel entrusts him with the case and an assistant, her son Sam. Will the two be able to solve the mystery of Lebanna despite Sherlock being allergic to Christmas? Perhaps the solution lies in some Arctic Friends cartoons that Santa watched as a child?