Sherlock Holmes

Doctor Watson

Nancy Partridge

William Easter

Heinrich Hinckel aka Richard Stanley

Naval Lt. Pete Merriam

Mr. Lang, government agent

Detective Lt. Grogan

Howe

Mrs. Hudson

Cady

George

Mrs. Pettibone

Mr. Ahrens

Sen. Henry Babcock

Antiques Store Sales Clerk

Army Inspector (uncredited)

Alfred Pettibone

Sir Henry Marchmont (uncredited)

Miss Pringle (uncredited)

Party Pianist (uncredited)

Hotel Doorman (uncredited)

Mrs. Ruxton

Director

Writer

Screenplay

Screenplay

Original Story

Director of Photography

Associate Producer

Producer

Music

Editor

Art Direction

Set Decoration

Costume Design

Assistant Director

Characters