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13 Episodes 1975 - 1975
Episode 1
50 mins
Marker has one week in which to find a witness. When he does so, he'll never forget the girl - or what his involvement cost her.
Episode 2
51 mins
Bruised and battered during his last case, Marker receives a surprise visitor to his hospital bed - DI Firbank - who has a proposition to put to him.
Episode 3
50 mins
A new beginning for Marker. Ron Gash wants him as new partner. But are Gash's methods of detection compatible with Marker's?
Episode 4
52 mins
Called in by a cabinet-maker to recover £700 he's owed for an antique clock, Marker finds that even the easiest of cases isn't all that simple.
Episode 5
51 mins
A girl named Tuesday brings more than beauty into Marker's life when he gets mixed up with the less-than-hospitable Lord of the Manor.
Episode 6
51 mins
Finding himself facing a very strange client, Marker decides it is time to head for fresh fields - providing his client allows him to leave.

Episode 7
50 mins
A new 'home', a new 'office', and his first client. A day to remember - a day of trouble. Marker's new starting point leaves a lot to be desired.

Episode 8
51 mins
A chance to make £1,000 for 'keeping an eye on things'. An offer too good to refuse finds Marker all at sea - without a life jacket.
Episode 9
52 mins
Marker's search for a young university student brings him face to face with violence - and a group of revolutionaries.
Episode 10
51 mins
Frank is hired by a husband to find his estranged wife and her lover. But he discovers the client's real motive is vengeance for a murder committed fifteen years earlier.
Episode 11
50 mins
An office clerk (Jenks) is acting strangely at home, so his worried daughter asks Marker to investigate, leading him to some strange office practices and a bit of fraudulent activity and greed by Jenks and his office manager..
Episode 12
52 mins
A tower block collapses and local council officials are under suspicion for bribery and corruption. Frank Marker uncovers some murky dealings between councillors and the builders who used sub standard materials in return for bribes taken for the lowest bid. The architect is adamant he is not involved but money has exchanged hands at some point, but between which parties.
Episode 13
50 mins
Case number 87. Marker bows out with a strange and intriguing case involving two villains who appear to have it made - until Marker arrives on the scene.