chance encounter in a supermarket ultimately results in Marker making the decision to move to Eton. To emphasise this, the opening titles to the episode are those used for the Brighton series, whereas the closing credits play over a film of Marker walking around Windsor and Eton, as used for the rest of the series. The episode also introduces the new regular character of Detective Inspector Percy Firbank (played by Ray Smith)—a local police officer whose interest is piqued by Marker. The remaining 12 episodes of series 5 often explore the Marker-Firbank relationship in detail. Marker is very suspicious of authority figures, especially policemen, and Firbank—at least initially—considers enquiry agents to be a lower form of life. The two gradually come to like each other, even when their relationship is tested—the final episode of the series is "John VII, Verse 24" (29 September 1971) in which it appears Firbank is corrupt and is accepting money from known criminals. Series 5 also demonstrates the variety that the programme could offer: in "Well—There Was This Girl, You See..." Marker again becomes involved in stolen jewels, but is exceptionally careful, too careful as it turns out, as his tactic of exerting pressure on a young man he thinks is involved backfires when he chooses to run to the police rather than Marker, and wrecks Marker's chances of getting a share of the reward money. An embarrassed Marker has to explain to an amused Firbank what has gone wrong. In "Shades of White", Marker is hired to monitor the suspicious activities of an ambitious local businessman's daughter—he becomes friendly with the businessman's housekeeper but then has his trust betrayed (again) when it transpires the housekeeper is acting to receive items stolen by the daughter's friends. Lighter moments in series 5 come with "Transatlantic Cousins" as a visiting American hires Marker to trace his English relatives, assisted by the tourist's daughter. They find out that the American family does have an English relative who has inherited a baronetcy but the daughter also discovers that, because of a previously unknown member of the family who was killed in a war, her father is actually the rightful inheritor of the title. Marker's failed alliances A further series of Eton-based episodes aired from 8 November 1972 to 14 February 1973, with the series now fully in colour. The final series began on 6 January 1975 with another arc