When a wealthy man dies, his avaricious relatives look forward to inheriting all his money. However, he leaves a provision in his will that they all must spend a week together in his castle before they will be able to inherit anything. At the castle (which is cut off from the outside world), the relatives soon begin to be killed off one by one, each strangled with an Indian scarf.

A serial killer named The Shark is terrorizing London by killing his victims with a speargun and then, dressed in a scruba-diver's wetsuit, using the city's sewer tunnels to make his getaway.

A London slasher pack the suitcases of his victims before stabbing them to death in this adaptation of Edgar Wallace's 'Secret of the Black Suitcases.'

The ghost of a hanged man returns to fulfill his promise. All of his accusers must die!

The country estate of American emigre Abel Bellamy is haunted by the ghost of the Green Archer, a 14th century Robin Hood type figure who terrorised the former lords of the manor. Now, with the gangster coming home on vaguely defined business and his niece Valerie arriving with her adoptive father to take up residence in the adjacent mansion, much to Bellamy's annoyance, the archer has returned. Who is he and what does he want?

A ring of counterfeiters is flooding the country with phony money, and suspicion falls upon a wealthy playboy who may--or may not--have amnesia.

A hooded serial killer finds a novel way to murder his victims--he lashes them to death with a whip. The police try to track him down before any more murders occur.

After a long time, a circus is back in the area of Tidal Basin and already the strange phantom has reappeared: the white clown! He robbed banks and stores without a system and disappeared without a trace. Lane and Higgins, together with the worn-out journalist Shapiro, hunt for the mysterious culprit in the dense London fog.

A Chinese detective breaks up a drug smuggling ring and tries to find the "Daffodil Killer". The drug smugglers had devised the ingenious method of smuggling heroin from Hong Kong in the stems of daffodils.

Mobsters conspire to loot another criminal's treasure secured in an enormous booby-trapped vault.

A British colonial policeman in Africa investigates a murder in a hospital up river.

Strange, rhymed advertisements in the TIMES unsettle three London gangsters - and rightly so, because soon the first of them are killed. The mysterious killer also catches a shady lawyer. Higgins and Lane find out that the key to the crimes is an unsolved diamond heist from jeweler Bolden. It looks like those involved are fighting over the loot. Eventually, it turns out that the "robbery" was actually a set-up insurance scam that Bolden was personally behind and that killed his employee. Shortly before the last survivor is sent to the afterlife, Higgins and Lane are able to confront the "invisible" murderer.