Randall is employed to deliver an envelope to an escaped convict without realizing that it contains an invitation to death.
Marty begins to recount the tale of a case he handled before his death, in which he became the unwitting accomplice in a top-level espionage plot.
A visit from an old friend lands Jeff in jail on suspicion of stealing a large sum in used notes, hijacked on their way to be incinerated.
Jeff and Jean find a dead body; Jean is later held hostage in order to keep her from testifying in the murder case.
While investigating Marty's claims that his own grave is being desecrated, Jeff stumbles across a plot to kidnap the heir to a huge fortune.
Having been implicated as the main man in a plot to supply fake bearer bonds, Jeff is given 24 hours to come up with $175,000 worth of bonds - or face certain death at the hands of a crook.
Jeff is hired to protect an aviary of birds who have inherited $2 million, to the fury of the deceased's relatives; then the birds begin to mysteriously die, one by one.
It takes a ghost to spot a phony medium and the same ghost to help his partner solve a murder mystery.
Jeff is hired by a ghost hunter to investigate at a manor where a lady claims to see a ghost; what he uncovers is something much more sinister.
Claire Faringham learns for the first time that her nephew, Marty Hopkirk, is dead when she arrives at his office and meets Jeff Randall and Marty's widow, Jean; nevertheless, the purpose of her visit is not changed.
Jeff is hired by a company to find out who is leaking information to the stock market; finding Jeff suspiciously out of character, Marty finds out that the real Jeff has been kidnapped.
Marty has a ghostly rival, Bugsy, a gangster who met his demise in the Roaring Twenties; not only does he have a repertoire of better tricks, he is also out to kill one of Jeff's clients.
Aristocrat Harold Pargiter and his Lords rob the British vault for a document proving that his family titles and deeds were stolen by King John in the 13th century and his succession to the throne.
Death comes to one member of a mind-reading act; when reaching the Russian Roulette part of the show, one cartridge is live.
Jean Hopkirk is the subject of some strange psychic phenomena when efforts are made to persuade her that her late husband is trying to contact her.