His Last Vow: 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?
guest cast
Lars Mikkelsen as Charles Magnussen
Timothy Carlton as Dad
Lindsay Duncan as Lady Smallwood
Director: Nick Hurran
Writer: Steven Moffat
Line Producer: Diana Barton
Original Airdate: 12 Jan 2014 on BBC
Series: Sherlock Season 3 Episode 3