I don't remember having an issue with the number of characters in Bronte Mettlestone, but I think some of them turn up in The Whispering Wars and I couldn't connect them with their appearance in the first book.

What is it with libraries not having Sayers in the format one wants? When I was reading the Harriet ones, my library only had them in either large print or audiobook. Then last year, I wanted specifically wanted the audiobook of The Unpleasantness at the Bellona Club and the library had a dramatisation but not an unabridged audiobook.