A Black night watchman at a chemical factory finds the body of a murdered white woman. After reporting it, he finds himself accused of the murder.

Sir Borotyn, a prominent Prague resident, is discovered murdered in his home, with all indications pointing to a vampire assault. The victim's friend, Baron Otto, and the physician who analyzes the body are certain that the vampire is the mysterious Count Mora, or perhaps his daughter, but receive little help from the law. Professor Zelen, an expert in the occult, is called in to assist with the investigation.

A Stumped insurance company is forced to re-hire the most expensive, most big-headed, but best arson investigator to solve a string of major losses.

When a prominent official is murdered at a banquet honoring Charle Chan, the detective and son Lee team up to expose an opium-smuggling ring.

Charlie's visit to Paris, ostensibly a vacation, is really a mission to investigate a bond-forgery racket. But his agent, apache dancer Nardi is killed before she can tell him much. The case, complicated by a false murder accusation for banker's daughter Yvette, climaxes with a strange journey through the Paris sewers.

While investigating the theft of antiquities from an ancient tomb excavation , Charlie discovers that the body of the expedition's leader concealed inside the mummy's wrappings.

A small, independent air delivery service is menaced by a mad scientist with a death ray machine that blows up planes in mid-flight.

In a Gothic-styled monastery, a monk named Javier sees the face of another monk, Juan, and suddenly attempts to bludgeon him to death with a heavy crucifix. Both men then relate their own versions of a story of romantic rivalry between them.

When a radio star is found murdered in her home, everyone assumes that the mysterious young woman discovered with her is the culprit — everyone, that is, but newspaper reporter Jerry Beall, who sets out to prove her innocence.

A husband and wife detective team takes on the search for a missing inventor and almost get killed for their efforts.

A major newspaper publisher dies in suspicious circumstances during a parlour game at a dinner party. The publishers secretary is the obvious suspect, but the inspector isn't so sure ...

While vacationing in St. Moritz, a British couple receive a clue to an imminent assassination attempt, only to learn that their daughter has been kidnapped to keep them quiet.

Wonderful idea to give a party with people who dislike each other. Late at night, everyone decides to go into the pool, except Stamm, who is drunk. Montague dives in as does Greeff and Leland, but only Greeff and Leland come out. Montague is no where to be found so Leland suspects foul play and calls the cops. Luckily, Philo is with the D.A. and comes along, but they do not find Montague. When they drain the pool the next day, they find nothing except what looks like dragon prints. Philo has his suspicions and tries to piece the clues together to find out what has happened.

A very nervous man named Cartwright comes into Perry's office to have the neighbor arrested for his howling dog. He states that the howling is a sign that there is a death in the neighborhood. He also wants a will written giving his estate to the lady living at the neighbors house. It is all very mysterious and by the next day, his will is changed and Cartwright is missing, as is the lady of the house next door. Perry has a will and a retainer and must find out whether he has a client or a beneficiary.

There are plenty of guilty secrets at the school where Hildegarde Withers teaches. When she finds the body of the pretty music teacher, she calls in her old friend Inspector Piper, who promptly arrests the obvious suspect. Clues multiply and everyone looks suspicious as Piper and Miss Withers continue their battle of the sexes.

Shortly before the curtain goes up the first time at the latest performance of Earl Carroll's Vanities, someone is attempting to injure the leading lady Ann Ware, who wants to marry leading man Eric Lander. Stage manager Jack Ellery calls in his friend, policeman Bill Murdock, to help him investigate. Bill thinks Jack is offering to let him see the show from an unusual viewpoint after he forgot to get him tickets for the performance, but then they find the corpse of a murdered woman and Bill immediately suspects Eric of the crime.

Val takes the assistance of a society reporter and a journalist to investigate the disappearance of her half-sister Arlene, a wealthy socialite who is involved in criminal activities.

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.

An actor is murdered live on air whilst a play is being broadcast. Everyone in the play and broadcasting house fall under suspicion.

Charlie is hired to deliver a pearl necklace to a millionaire at his ranch. When murder intervenes he disguises himself as a Chinese servant and begins sleuthing.

Charlie Chan is sought out by Pamela Gray, a desperate young socialite whose brother Paul awaits execution for the murder of a weapons inventor. Pamela is convinced of his innocence.

A mysterious criminal known as The Whispering Shadow commits crimes by means of a gang he controls by television and radio rays. Jack Norton, whose brother was murdered by The Whispering Shadow, suspects that the eerie Professor Strang - whose ghostly wax museum contains figures far too lifelike - may be involved in the crimes.

After a detective is assaulted by thugs and placed in an asylum run by Professor Baum, he observes the professor's preoccupation with another patient, the criminal genius Dr. Mabuse the hypnotist. When Mabuse's notes are found to be connected with a rash of recent crimes, Commissioner Lohmann must determine how Mabuse is communicating with the criminals, despite conflicting reports on the doctor's whereabouts, and capture him for good.

As the demand for raw silk goes sky high, crooked businessman Wallace Myton corners the market with plans to drive up the price. Determined to fulfill his contracts, manufacturer Donald Kilgore imports $3 million worth of silk to Seattle and accompanies it by special train to New York. But when his secretary is found murdered, Kilgore soon discovers Myton has planted three killers on board with orders to stop the express and its passengers dead in their tracks.