Marker tangles with some gangsters over a horse-doping racket.

Marker considers a change of career after his beating, but agrees to take on a case involving tenants who are in arrears.

Marker reluctantly decides to gets his own back on the people who attacked him. An ex-policeman has a business proposal.

Marker, now working with Ron Gash in Walton, pursues a debt owed to a local craftsman by his brother-in-law.

A woman asks Marker to gather evidence of her husband's adultery.

A man hires Marker to trace his missing wife.

Marker, now relocated to Chertsey, is hired by two shady businessmen to trace a former partner.

An eccentric old woman hires Marker to protect some rare orchids from theft or interference.

A businessman asks Marker to trace his radical activist son.

A middle-aged man engages Marker to trace his wife, whom he claims is living with another man, but he has lied and it is the man he is really interested in.

A concerned woman asks Marker to investigate her father, the chief clerk at an engineering firm.

Marker is engaged to track down a former council employee who has accepted bribes from a corrupt property developer.

A hotelier hires Marker to investigate her daughter-in-law's suspicious behaviour.