"Sherlock III: His Last Vow" on Masterpiece Mystery! airs Sunday at 9:00 p.m.
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?
"Sherlock III: His Last Vow" on Masterpiece Mystery! airs on Sunday, February 2nd at 9:00 p.m.