Learn more: http://to.pbs.org/2foyetD | #SherlockPBS
See a preview of Sherlock, Season 4, Episode 2, airing Sunday, January 8th, 2017 at 9/8c on MASTERPIECE on PBS. #SherlockPBS
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Season four begins with the mercurial Sherlock Holmes (Benedict Cumberbatch), 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.