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?
Watch a scene from Masterpiece Mystery! Sherlock season 3, episode 3 His Last Vow
Behind the scenes: Sherlock stars Benedict Cumberbatch, Amanda Abbington (Mary), Executive Producer/Writer Steven Moffat and Producer Sue Vertue discuss the action of Season 3, Episode 3 (His Last Vow) as seen on MASTERPIECE on PBS.
Photo Credit: Courtesy of (C)Robert Viglasky/Hartswood Films for MASTERPIECE