House of Blackmail: Cast
Mary Germaine
Carol Blane
William Sylvester
Jimmy
Alexander Gauge
John Markham
Denis Shaw
Bassett
Patricia Owens
Joan
C. Denier Warren
Jock
Barry Wynne
Billy Blane
Hugo Schuster
Dr. Welich
John Arnatt
Pete Carter
Sidney Vivian
Police Inspector (uncredited)
John H. Watson
Bert - Café Customer (uncredited)