During World War I, a novelist declared dead is recruited by British intelligence and sent to Switzerland under a new identity to assassinate a German spy. Teamed with a fellow agent posing as his wife and an eccentric assassin known as “the General,” the trio close in on their target — until two of them grow ambivalent when their duty to the mission clashes with their consciences.
Assistant District Attorney Jeffery Powell has just sent an innocent man to prison for the murder of a gambler. Powell is in love with, Marion Courtney, but he's unaware that Marion is the sister of the innocent man he sent to prison. Marion gets herself committed to a women's prison to get proof from inmate, Evelyn 'Duchess' Thane, that her brother is innocent. Powell learns of Marion's plight and believes she's in love with the man he sent to prison.
James Houghland, inventor of a new method by which television signals can be instantaneously sent anywhere in the world, refuses to sell the process to television companies, who then send agents to acquire the invention any way they can. On the night of his initial broadcast Houghland is mysteriously murdered in the middle of his demonstration and it falls to Police Chief Nelson to determine who the murderer is from the many suspects present.
After a series of murders, a man finds out that his mother was bitten by a vampire bat during her pregnancy, and he believes that he may be the vampire committing the murders.
While a distinguished astronomer is giving a lecture in a planetarium, a shot rings out and one of the audience members is found dead. A tough detective and a brassy female reporter lock horns as they both try to break the case.
Richard Hanney has a rude awakening when a glamorous female spy falls into his bed - with a knife in her back. Having a bit of trouble explaining it all to Scotland Yard, he heads for the hills of Scotland to try to clear his name by locating the spy ring known as The 39 Steps.
Holmes, retired to Sussex, is drawn into a last case when his arch enemy Moriarty arranges with an American gang to kill one John Douglas, a country gentleman with a mysterious past. Holmes' methods baffle Watson and Lestrade, but his results astonish them. In a long flashback, the victim's wife tells the story of the sinister Vermissa Valley.
Mr. Wong is a "harmless" Chinatown shopkeeper by day and relentless blood-thirsty pursuer of the Twelve Coins of Confucius by night. With possession of the coins, Mr. Wong will be supreme ruler of the Chinese province of Keelat, and his evil destiny will be fulfilled. A killing spree follows in dark and dangerous Chinatown as Wong gets control of 11 of the 12 coins. Reporter Jason Barton and his girl Peg are hot on his trail, but soon find themselves in serious trouble when they stumble onto Wong's headquarters.
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.
The owner of a large mansion in the country throws a costume party for some of his friends. However, the party turns sour when he is found stabbed to death in a closet. The police and a guest try to discover who committed the murder.
When a city councilman is murdered while investigating allegations of drug dealing going on a a somewhat disreputable sideshow, the daughter of the chief suspect teams up with a newspaper reporter to find the real killer.
Out of the Mystic Temples of Old India crept this terrible Monster to wreak vengeance of the Hindu Gods. One by one its victims fell with not a trace of the bloody assassin.
Rival newspaper reporters Pat Morgan and Ted Rand find themselves unraveling the mystery behind the death of a millionaire philanthropist who fell from his penthouse balcony. When it is discovered that the plunge was not an accident, the building's residents come under suspicion. Soon, the body count begins to mount as three more murders occur by strangulation.
A man known to be a mute is suspected of committing a murder, as he was noticed at the scene. However, witnesses saw and heard him talking as he was leaving the scene of the crime. The police must determine if he is the actual killer or if he is being framed.
In London, a secret society led by lawyer Thaddeus Merrydew collects the assets of any of its deceased members and divides them among the remaining members. Society members start dropping like flies. Sherlock Holmes is approached by member James Murphy's widow, who is miffed at being left penniless by her husband. When Captain Pyke is shot, Holmes keys in on his mysterious Chinese widow as well as the shady Merrydew. Other members keep dying: Malcom Dearing first, then Mr. Baker. There is also an attempt on the life of young Eileen Forrester, who became a reluctant society member upon the death of her father. Holmes' uncanny observations and insights are put to the test.
Thirteen years after a dinner party in which the thirteenth guest failed to arrive, the remaining guests are being murdered one by one, and their bodies being placed at the same dinner table in the appropriate seats they occupied thirteen years prior.