Dowiadujemy się, że w pierwszym odcinku pojawi się Andrew Scott w roli Jamesa Moriarty'ego. Zobaczymy go w scenie retrospekcji, która wyjawi nam kulisy decyzji Sherlocka z finału poprzedniego sezonu.
Więcej spoilerów w poniższych filmikach oraz na zdjęciach. Prace trwają w Londynie. Więcej zdjęć TU, TU i TU.
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