Garra Escarlate

Basil Rathbone

Sherlock Holmes

Nigel Bruce

Doctor Watson

Gerald Hamer

Potts / Tanner / Ramson

Paul Cavanagh

Lord Penrose

Arthur Hohl

Emile Journet

Miles Mander

Judge Brisson

Kay Harding

Marie Journet

David Clyde

Police Sergeant Thompson

Ian Wolfe

Drake

Victoria Horne

Nora

Al Ferguson

Attendant (uncredited)

Olaf Hytten

Hotel Day Desk Clerk (uncredited)