The Master Blackmailer

Sherlock Holmes

Dr. John Watson

Charles Augustus Milverton

Lady Diana Swinstead

The dowager

Inspector Lestrade

Lady Eva Blackwell

Mrs Hudson

Agatha

Bertrand

The Hon. Charlotte Miles

Colonel Dorking

Harry, Earl of Dovercourt

Hebworth (Alias Veitch)

Stokes

Lillie

Daphne

Tronson, The Butler

Lewis, Dorking's Batman

Art Gallery Owner

Hobbs, The Painter

Auctioneer

Emile

Cabaret Artiste