The Silent Barrier

Sheldon Lewis

Mark Bower

Corinne Barker

Millicent Jacques

Florence Dixon

Helen Wynton

Donald Cameron

Charles K. Spencer

Gladys Hulette

Etta Stampa

Adolph Milar

Stampa (as Adolf Milar)

Ernest Des Baillets

Barth

Fuller Mellish

McKenzie

Joseph Burke

Professor Lammenois

Mathilde Brundage

Lady Lavasour

John Raymond

Sir George Lavasour (as Jack Raymond)

Robert Lee Keeling

Delavere (as Rob Lee Keeling)