Marker is faced with a head-on collision with D.I. Firbank.

Marker takes on an investigation and finds himself manipulated by several people  ̶  including DI Firbank.

Marker finds a case involving an old reprobate and a young American visiting Britain.

It appears as though Marker's interests and those of D.I. Firbanks are the same - but are they?

Marker is hired after a lady finds a picture of a young woman in her husband's wallet.

Marker is hired to look after a client's welfare.

His latest case leads Marker into the centre of a family squabble.

Marker encounters some strong and powerful women.

When Marker reluctantly agrees to try to find a woman's missing husband, but facts about the story he's been told by the woman don't add up, he enlists the help of Inspector Firbank.

Things get unusual when Marker is hired to watch the antics of a wayward husband.

Marker is hired to find out who is making threatening phone calls to a woman living alone.

Things are looking up when Marker is invited to join an enquiry agency.

After Frank saves an old lady from a potential shoplifting charge, and recognises her financially desperate son as a former fellow prison inmate, he's contacted by the man's worried wife.