Preview: Season 4 Episode 3 | 20s

See a preview for the Sherlock Season 4 finale, "The Final Problem," premiering Sunday, January 15th, 2017 at a special time, 7/6c, on MASTERPIECE on PBS.[Note: The episode itself begins at approximately 7:20/6:20c] #SherlockPBS

Aired: 01/15/17

Rating: TV-14

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