The third series of Sherlock comes to a dramatic end on Sunday 12 January with the highly anticiapted episode, His Last Vow.
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The third show, which is based on the original Sir Arthur Conan Doyle story The Adventure of Charles Augustus Milverton, is said to see Benedict Cumberbatch's Sherlock Holmes back to his sociopathic best following a slightly out of character display of affection in episode two.
Sherlock's sidekick Dr John Watson, played by Martin Freeman, is also rumoured to reveal a fiercer side to his personality in the final epsiode, as is pathologist Molly Hooper.
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