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13 Episodes 1971 - 1971
Episode 1
51 mins
While shopping in a local supermarket, Frank Marker sees an old woman drop (Mrs Stuart) a tin into her bag rather than her shopping basket. This is noticed by another woman customer who reports it to a shop worker. Frank deliberately collides with Mrs Stuart and knocks her bag to the floor spilling out the tin, thus avoiding a possible prosecution. Mrs Stuart invites Frank to her home where he notices an old silver box on her mantlepiece. Meanwhile Gerald Gurney-Stuart (Mrs Stuart's son, played by Barry Foster) is trying to get money for his company. Gerald and wife (patricia) call around to his mother to take her out and end up in the same Indian restaurant that frank is in with his landlady. When Gerald goes back to his mother's home says he will take the valuable silver box away to have it repaired, but he tries to sell it. Gerald's wife Patricia contacts asks Frank to make sure her husband isn't up to no good. Frank finds the Silver box in an antique shop and almost gets arrested by Det. Insp. Fairbanks (Ray Smith), who wants to know why frank is interested in this box. Frank is questioned but released and on visiting Mrs Stuart, finds out that Gerald 'borrowed' it to get it repaired. Frank visits Gerald and thinking Frank is trying to blackmail him and so calls the police and admits to everything.

Episode 2
50 mins
A girl turns up at Marker's office with a newspaper ad offering a £300 reward for the return of a necklace stolen from a jeweller's premises. She claims to know of its whereabouts and who stole it and asks him to investigate its theft in return for half of the reward money. However the local police inspector gets wind of Marker's involvement and given his previous involvement in stolen jewellery (which resulted in a spell in prison) decides to check the veracity of Marker's involvement.

Episode 3
49 mins
Marker is hired to find out who is making threatening phone calls to a woman living alone. His furtive observations bring unexpected results.

Episode 4
50 mins
Framed. Marker, hired to watch the antics of a wayward husband, finds himself hooked up in a very unusual affair of the heart.

Episode 5
51 mins
A routine request to find a missing husband seems fishy to Marker, but he has no idea of the danger his inquiries will provoke.

Episode 6
50 mins
The ladies of Cheviot House have sharp tongues, as Marker finds out to his cost when his client Rose Mason sets them wagging.

Episode 7
60 mins
His latest assignment leads Marker into the centre of a family squabble over who gets what, from whom.

Episode 8
51 mins
Marker finds himself at the centre of hypocrisy and villainy when he is hired to look after a client's welfare.
Episode 9
50 mins
When Mrs Meadows finds the photograph of a beautiful young girl in her husband's wallet, Marker is contacted - and receives a surprise from what he uncovers.
Episode 10
49 mins
Marker is hired by solicitors acting for Ruth Bailey to track down her missing son, who is being kept from her by her vengeful estranged husband, assisted by his girlfriend Ann. The boy is to be made a ward of court at an upcoming hearing but Mr Bailey has spirited the boy away and is refusing to say where he is, even under the threat of imprisonment for perjury. Marker works with local CID officer DI Firbank in order to track down the missing boy.

Episode 11
50 mins
Marker must sort out a fascinating case involving a streetwise old reprobate and a young American visiting Britain.
Episode 12
60 mins
Marker is hired to keep an eye on a wealthy family's rebellious teenager Anne Lesley-Anne Down, whom her father thinks is keeping bad company. He has high aspirations in society but is worried that a spate of local burglaries possibly connected to his daughter's two unsavoury male companions might thwart his ambitions. However DI Firbank is more interested in the family's former convict housekeeper Barbara Lewson-Jones, so Marker and Firbank join forces to uncover the true identity of the thieves.

Episode 13
49 mins
Marker is hired by Jane Holland to look into a case of victimisation against her policeman husband who has been suspended for an alleged theft of money from a purse he had found. She seems to think a senior officer has framed him and Marker is surprised to hear that she suspects that DI Firbank is crooked and is responsible for the situation her husband finds himself in.