While perusing the books of an engineering company, fastidious auditor Frank Manning encounters rum goings on when he is approached by a woman who claiming she is being blackmailed. She begs him to find certain letters and he eventually agrees. Having obtained the letters, he takes them to a specified address where, to his horror, he finds a man, fully clothed, dead in the bath.
Routine tests on a traffic accident victim lead to shocking discoveries when the man's blood is found to be unidentifiable and x-rays reveal a disc embedded in his brain. His fabulous tale of being an escaped prisoner from an alien spaceship takes a turn for the sinister when the hospital staff realise that they're under a state of siege...
Two men working on the docks close to London's Tower Bridge find the body of an unidentified man floating in the Thames. The police later identify the body to be that of a diamond courier from Holland. The police have to find his murderer, as well as the missing diamonds he was carrying.
When a woman inherits a valuable house, her nasty husband and his mistress plot murder. But the house has a protective poltergeist who thwarts the wicked pair.
A writer of murder mysteries finds himself caught up in a string of murders in London.
What appears to be a cut-and-dried case of murder of an aging one time showgirl on Hampstead Heath by her lover is complicated by several factors, including a far more respectable paramour, and her insistence that a great inheritance was due her that nobody can verify.
When a robbery at a racetrack goes wrong ex-con Johnny Bannion is caught and sent back to prison. He won't tell the rest of the gang where he has stashed the loot leading to violent consequences.
Dr. Decker returns from Africa after a year, presumed dead. In that year, he discovered a way of growing plants and animals to an enormous size. He brings back a baby chimpanzee to test out his theory. As he has many enemies at home, he decides to use his chimp, 'Konga', to 'get rid of them'. Then Konga grows to gigantic proportions and wreaks havoc all over London!
Several murders of nuclear scientists, that baffles Scotland Yard, occur in London about the same time that Bill Locklin, a special officer from the United States State Department, arrives to oversee the transfer of Professor Leon Dushenko, a Russian scientist who as fled the U.S.S.R. An attempt is made on Dushenko's life with a monkey's paw-print found at the scene.
An atomic scientist is found floating in a river with a bullet in his back and a radioactive halo around his body. The radioactivity has put him seven-and-a-half seconds ahead of us in time. He teams up with a reporter to stop his evil double from destroying his experiments in artificial tungsten.
Two reporters are held hostage in old castle, by thief, looking for jewels, that he had buried, after robbing a local house.
An escaped murderer flees France to England, where he forces an ex-forger, now established as a reputable estate owner, and the forger's daughter who knew nothing of his past, to counterfeit 5-pound notes for mass distribution around the countryside.
Peter Chance suffers a blow to the head and wakes up with amnesia in a luxurious home, where a doctor and several women tell him he's a missing heir who's inherited millions. But Peter soon suspects something is not quite right with their story. He sets out to learn the truth before he's forced to sign a document that purportedly finalizes the transfer of the estate. This drama is based on Hugh Wheeler's novel Puzzle for Fiends.
A young woman going to her wedding is waiting for her fiancée, a hood in custody, who is allowed by the police to go to his wedding.
A man tells his wife that the police are after him for having killed a bookie during an alcoholic binge, but that he is innocent and is being framed for the murder. The wife and her brother hide him and try to find out who the real killer was. The more they investigate, the more holes they begin to find in the husband's story.
Antonio Riccardi, a rare stamp dealer who is secretly a hired killer, pays for the violin lessons of his gifted brother Giuseppe. To meet the expenses of Giuseppe's concert debut he accepts a further job, but his decision to do so provides Detective Inspector Carson, who has long hoped to ensnare Tony, with an opportunity that might now enable him to bring about his downfall.
After Audrey leaves prison after being framed for jewel theft, she gets a job offer from the mysterious Mr. Malpas, triggering a plot involving a missing heir, diamonds and kidnapping.
A young woman commits suicide. Her sister is not ready to let the death go without someone answering a few questions. Namely, was it really suicide, and where is the large amount of money her sister withdrew from the bank the day before her death.
A man attempts to convince his wife she is going mad so he can continue having an affair.
Professional killer Kersten arrives in England and is hired by Donald Edwards to murder his wife Helene. But Helene's lover Robert Vaughan discovers the plot and he trails Kersten and Edwards to a country cottage.
