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.

Anne Crandall is the mayor of a small town in Vermont. Her deceased husband had been the mayor for years and when he died, she was left to carry on and to raise his daughter from his first marriage. She lives with the daughter, her father-in-law and a housekeeper. In the town square, there was a statue of her late husband and every year since his death, they have an anniversary celebration there. This year during a thunderstorm, the statue is hit by lightning and the head falls off. The daughter insists that a new statue be erected instead of patching the old one. Mayor Crandall is sent to New York to interview the prospective sculptor, George Corday.

Ellen Creed is a housekeeper who looks after Leonora Fiske, a retired actress living in the English countryside. When Ellen's eccentric sisters visit their sibling at Leonora's home, tensions soon lead to murder.

A Prohibition-era nightclub crooner has his career is cut short when his throat is slashed by a mob boss.

A nightclub dancer makes it big in modeling, leaving her dancer boyfriend behind.

During India's first years of independence from Britain, Steve Gibbs lands his armaments loaded plane in Ghandahar province hoping to get rich. Pacifist Prime Minister Singh hopes to reach an agreement with guerilla leader Khan, the maharajah is a fool, and the British residents are living in the past. Steve's love interest is Joan Willoughby, the blind daughter of a parson.

Popular mailcoach driver Uncle Willie is in fact in league with the town's crooked banker. They plan to have the bank robbed after emptying it, and when Willie's choice for this doesn't show in time, he gets some local boys to do it. When his man does turn up he decides to stick around, as he is pals with the sheriff and also takes a shine to Willie's daughter Allison. This gives the bad men several new problems.

Victor Ballard, a happy-go-lucky albeit impoverished sidewalk photographer, shares a New York City studio apartment with Polish immigrant painter Stefan Janowski. The big city doles out joy and misery indiscriminately: In the apartment below Victor and Steve, Gus Nelson learns that his wife has given birth to quintuplets, while the lonely tenant in the apartment below Gus has given up on life and committed suicide.