The Master Blackmailer

Jeremy Brett

Sherlock Holmes

Edward Hardwicke

Dr. John Watson

Robert Hardy

Charles Augustus Milverton

Norma West

Lady Diana Swinstead

Gwen Ffrangcon Davies

The dowager

Colin Jeavons

Inspector Lestrade

Serena Gordon

Lady Eva Blackwell

Rosalie Williams

Mrs Hudson

Sophie Thompson

Agatha

Nickolas Grace

Bertrand

Sarah McVicar

The Hon. Charlotte Miles

David Mallinson

Colonel Dorking

Brian Mitchell

Harry, Earl of Dovercourt

Hans Meyer

Hebworth (Alias Veitch)

Stephen Simms

Stokes