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Video: Sherlock season 4 teaser - Dark secrets revealed


A new teaser for “Sherlock” Season 4 shows Benedict Cumberbatch’s character in a dark place.

Toby Jones will play the villain in this season, and in the teaser he seems to exert power over Cumberbatch’s Holmes. “What’s the very worst thing you can do to your very best friends?” the evil man asks. “Tell them your darkest secret.”

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