Sherlock: 'The darkest season yet'
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Sherlock: New series 'the darkest season yet'

Benedict Cumberbatch, Martin Freeman and Amanda Abbington talk about season four of Sherlock, which writers have described as the darkest yet.

The new series of Sherlock starts on BBC One on New Year's Day at 20:30 GMT.

  • 24 Dec 2016
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