What Do the Hosts of My Dad Wrote a Porno Say Is Coming in Chapter 6?

At the end of the maze chapters on My Dad Wrote a Porno, Jamie Morton and his co-hosts say they are staying in the maze because there is more to come. They read the title of chapter 6 as The Second Client, Jim Stirling, though one of them wonders whether Jim Stirling had already been mentioned in the blurb. They also say chapter 6 is about the Duchess, who is still an enigma and could turn up anywhere in the grounds. The chapter they have just finished ends with Belinda securing another meeting after the encounter in the maze, and with Alfonse Stirbacker inviting her to Brussels.