A Scotland Yard investigator looks into four mysterious cases involving an unoccupied house.

In seventeenth century England Lord Whitman wages unending war on what he sees as the ever-present scourge of witchcraft, and many local villagers have suffered at his hands. But one victim uses her occult powers to curse his family, enlisting unknowing help from one of the household.

Evil lurks in the gloomy house at Markham Manor where a deranged Sir Edward is the chained prisoner of his brother Julian. When Sir Edward escapes, he embarks on a monstrous killing spree, determined to seek revenge on all those whom he feels have double-crossed him.

After resigning, a secret agent is abducted and taken to what looks like an idyllic village, but is really a bizarre Kafkaesque prison. His warders demand information. He gives them nothing, but only tries to escape.

Charles Dobbs is a British secret agent investigating the apparent suicide of Foreign Office official Samuel Fennan. Dobbs suspects that Fennan's wife, Elsa, a survivor of a Nazi Germany extermination camp, might have some clues, but other officials want Dobbs to drop the case. So Dobbs hires a retiring inspector, Mendel, to quietly make inquiries. Dobbs isn't at all sure as there are a number of anomalies that simply can't be explained away. Dobbs is also having trouble at home with his errant wife, whom he very much loves, having frequent affairs. He's also pleased to see an old friend, Dieter Frey, who he recruited after the war. With the assistance of a colleague and a retired policeman, Dobbs tries to piece together just who is the spy and who in fact assassinated Fennan.

Doctor in Clover is another 'Doctor' movie, but this time Leslie Phillips is the main doctor in the story, looking for love and romance from the hospital nurses, much to the annoyance of the main Administrator (James Robertson Justice) who wants his doctors to be 100% focussed on the job. Numerous antics follow, with Phillips getting Justice fixed up with the new prim-and-proper Matron (Joan Sims) and his attempted failures to lure the hospital's beauty, the physiotherapist.