Watch Online | Masterpiece - Sherlock, Season 4: The Six Thatchers

Last Updated by Dale Fisher on

The mercurial Sherlock Holmes (Benedict Cumberbatch) is back once more on British soil, as Doctor Watson (Martin Freeman) and his wife, Mary (Amanda Abbington), prepare for their biggest challenge yet: becoming parents.

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View our Sherlock page for video, photos, an episode guide and more.