Sherlock co-creator, writer and actor Mark Gatiss—who plays the conniving Mycroft Holmes—previews the upcoming special, “The Abominable Bride,” (premiering 1/1/15 on PBS) and takes you behind the scenes of the hit show. From hatching the idea for the series on a train ride, to casting Benedict Cumberbatch, Gatiss reflects on bringing Sherlock to life in the 21st century.

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