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?
Elenco: Benedict Cumberbatch , Martin Freeman , Rupert Graves , Mark Gatiss , Una Stubbs , Amanda Abbington , Louise Brealey , Lars Mikkelsen , Mark Gatiss , Rupert Graves , Russell Tovey , Una Stubbs .