A domineering money-bags' suppressed incestuous urges go into overdrive when her half-brother brings a new bride home to the family’s gloomy Fifth Avenue mansion. The title refers to a secret soundproofed chamber that the villainess uses to entrap her enemies.

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Evelyn Venable

Anne Darrow

Mary Morris

Victoria Van Brett

Anne Revere

Caroline Van Brett

Kent Taylor

Rip Van Brett

Guy Standing

Mortimer Neff

Colin Tapley

Dr. John Lucas

Virginia Howell

Avery

Halliwell Hobbes

Mr. Chase

Frank Dawson

Telson

Helen Shipman

Louise

Leonard Carey

William

Burr Caruth

Ralph Remley

Phillips Smalley

May Foster

Rose Plumer

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