The final episode of the trilogy is "How About It, Frank?", in which he reluctantly takes revenge on those responsible for his beating up and narrowly avoids another encounter with the wrong side of the law. He enters into a partnership with another enquiry agent, Ron Gash (Peter Childs). Gash is an ex-policeman and, although much more likeable than Rylands (of the Brighton episodes) he does have very different ideas about the job from Marker. Although Marker would show interest in money if a large quantity of it appeared to be heading his way (such as "Well—There Was This Girl, You See ...") he never considers raising his fees to provide himself with a more comfortable living standard. Gash is far more profit-motivated and also considers Marker's shabby appearance to be off-putting to potential clients. Yet again Marker decides he doesn't like working with a partner, and in the episode "What's to Become of Us?" (10 February 1975) Gash and he part ways peacefully and amicably. For the final half-dozen episodes Marker relocates to Chertsey in Surrey, partly to avoid a clash of location with Gash's business.