Benedict Cumberbatch and the Sign of Four (or is it Three?)

Sherlock star Benedict Cumberbatch gets some help from his friend Count Von Count to solve a brain-bending challenge from Murray-arty. #Counterbatch. Thanks to our friends at MASTERPIECE (http://www.pbs.org/masterpiece) and Sesame Workshop (http://www.pbskids.org/sesame) for their help with this video.
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If you like this video, check out our #TomNomNom treat with Tom Hiddleston and Cookie Montster: http://www.youtube.com/watch?v=b_ubVV...

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