Basil Rathbone as Sherlock Holmes

Nigel Bruce as Doctor Watson

Gerald Hamer as Potts / Tanner / Ramson

Paul Cavanagh as Lord Penrose

Arthur Hohl as Emile Journet

Miles Mander as Judge Brisson

Kay Harding as Marie Journet

David Clyde as Police Sergeant Thompson

Ian Wolfe as Drake

Victoria Horne as Nora

Al Ferguson as Attendant (uncredited)

Olaf Hytten as Hotel Day Desk Clerk (uncredited)

Bobby Hale as Villager in Pub (uncredited)

Harry Allen as

Gertrude Astor as

Clyde Fillmore as

Charles Francis as

George Kirby as

Pietro Sosso as