In 1910 Manhattan, Victoria Van Brett, a bitter spinster heiress lives an isolated life with her sister Caroline. Her domineering urges go into overdrive when their half-brother Rip brings a new bride home to the family’s gloomy Fifth Avenue mansion, built by their late industrialist father. The title refers to a secret soundproofed chamber that the villainess uses to entrap her enemies.

After years of questioning why people fear him, Death takes on human form so he can mingle among the mortals and find an answer. However, events soon spiral out of control as he falls in love with the beautiful young Grazia, the only woman not afraid of him. As he falls in love with her, her father sees him for what he is and begs him to return to his duties. Death must decide whether or not to seek his own happiness or sacrifice it so that Grazia may live.

In the lower-middle-class Adams family, father and son are happy to work in a drugstore, but mother and daughter Alice try every possible social-climbing stratagem despite snubs and embarrassment. When Alice finally meets her dream man Arthur, mother nags father into a risky business venture and plans to impress Alice's beau with an "upscale" family dinner. Will the excruciating results drive Arthur away?