Synopsis revealed for Sherlock S3E3: His Last Vow

The BBC have revealed the official synopsis for the final episode of Sherlock S3, premiering on BBC One on January 12 2014.

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In the final episode of this new series, written by Steven Moffat, a case of stolen letters leads Sherlock Holmes into a long conflict with Charles Augustus Magnussen, the Napoleon of blackmail, and the one man he truly hates.