Donald Woods

Juan Cesare

Margaret Lindsay

Florence Ballau

C. Aubrey Smith

Gerard Lytton

Henry O'Neill

Victor Ballau

Robert Barrat

Inspector Von Brinkner

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)

Betty Farrington

Frieda (uncredited)

Olaf Hytten

Scotland Yard Radio Operator (uncredited)

Charles Lane

Man in Front Row (archive footage)

Eric Mayne

Bidder at Auction (uncredited)

Paul Panzer

Detective (uncredited)

Frank Thornton

(uncredited)