Sherlock and John discover that a case of blackmail is more than just a threat to topple the monarchy.
Director:
Paul McGuigan
Cast:
Benedict Cumberbatch
Martin Freeman
Rupert Graves
Una Stubbs
Loo Brealey
Andrew Scott
Lara Pulver
Danny Webb
Andrew Havill
Todd Boyce
Oona Chaplin
Nathan Harmer
Rosalind Halstead
Peter Pedrero
Luke Newberry