Sherlock Holmes' discovery of a mysterious musical score initiates a devious Christmas challenge set by Irene Adler, with clues that are all variations on the theme of 'theft without theft'. In the snowy London lead-up to Christmas, Holmes' preoccupation with the "Adler Variations" risks him neglecting the case of his new client, Norwegian arctic explorer Fridtjof Nansen, who has received a series of threats in the form of animal carcasses left on his doorstep. Could they really be gifts from a strange spirit that has pursued Nansen since the completion of his expedition to cross Greenland? And might this case somehow be related to Irene Adler's great game?
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