The Final Problem Trailer – Sherlock Series 4 Ep 3 – Sherlock – BBC

In the final episode of this series, written by Mark Gatiss and Steven Moffat, long-buried secrets finally catch up with the Baker Street duo. Someone has been playing a very long game indeed and, alone and defenceless, Sherlock and Dr Watson face their greatest ever challenge. Is the game finally over?

Trailer for Sherlock Series 4: Episode 3 – The Final Problem.

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