What do You think about The Bilbao Looking Glass (1984)?
It was hard to put this book down before finishing, so I didn't. Although the characters aren't as wonderful and whacky as in previous books, this book presents class consciousness (where classes aren't supposed to exit) from both sides, and it is done well. The little asides, the outright rudeness, and the all-pervasive "them" and "we" trap Sarah and Max in the middle, forcing the reader to root for the couple against both sides. There are moments when you wonder how Max and Sarah will ever get out from under everything seeking to crush their romance.
—Maria