Scotland Yard Investigator

C. Aubrey Smith

James Collison

Erich von Stroheim

Carl Hoffmeyer

Stephanie Bachelor

Toni Collison

Forrester Harvey

Sam Todworthy

Doris Lloyd

Emma Todworthy

Richard Fraser

Robert Cartwright

Eva Moore

Mary Collison

Victor Varconi

Jules

Emil Rameau

Professor Renault

Frederick Worlock

John Brent

Olaf Hytten

Purvis

Tarquin Olivier

Young Cartwright

Georges Metaxa

Henri

Colin Campbell

Waters

George Blair

Director

Randall Faye

Screenplay

George Blair

Associate Producer

Ernest Miller

Director of Photography

Ed Borschell

Sound

Richard Cherwin

Music Director

Frank Hotaling

Art Direction

Charles S. Thompson

Set Decoration

Fred Allen

Editor

William Bradford

Cinematography

Charles Maxwell

Original Music Composer

Bob Mark

Makeup Supervisor