Donald Woods

Juan Cesare

Margaret Lindsay

Florence Ballau

C. Aubrey Smith

Gerard Lytton

Henry O'Neill

Victor Ballau

Robert Barrat

Inspector Von Brinkner

Florence Fair

Teresa

Frank Reicher

Von Stein

Charles Judels

Salvatore

Rafaela Ottiano

Lili Salvatore

Paul Porcasi

Antonio

Eily Malyon

Fredericka

Egon Brecher

Karl

Herman Bing

Baker

Henry Kolker

Auctioneer

Barlowe Borland

Eric (uncredited)

Glen Cavender

Detective (uncredited)

Wheaton Chambers

Servant (uncredited)

Carlos De Valdez

Conductor (uncredited)

Charles Fallon

Apothecary (uncredited)

Betty Farrington

Frieda (uncredited)

Olaf Hytten

Scotland Yard Radio Operator (uncredited)

William Irving

Policeman Schultz (uncredited)

Charles Lane

Man in Front Row (archive footage)

Eric Mayne

Bidder at Auction (uncredited)

William V. Mong

Fishback (uncredited)

David Newell

Rodrigo (uncredited)

Paul Panzer

Detective (uncredited)

Russ Powell

First Taxi Driver (uncredited)

Adrian Rosley

Pasquale (uncredited)

Ferdinand Schumann-Heink

Policeman Otto (uncredited)

Louise Seidel

Baker's Daughter (uncredited)

Ruthelma Stevens

Fraulein von Elsner (uncredited)

Frederick Sullivan

Romberg (uncredited)

Bernard Suss

Heinrich (uncredited)

Frank Thornton

(uncredited)

Anders Van Haden

Bidder (uncredited)

William Wagner

Coroner (uncredited)

The White Cockatoo

While the Patient Slept

The Florentine Dagger

Murder by an Aristocrat

The Patient in Room 18

Mystery House