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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. But how do you tackle a foe who knows the personal weakness of every person of importance in the Western world?
First Air Date : Jul 25, 2010
Last Air date : Jan 15, 2017
Episode : 12 Episode
Season : 4 Season
Runtime: 90:14 minutes
Studio: BBC One
Country: United Kingdom, United States of America
