I want to try making a personal list of books to read that have at least one diehard fan. I'm looking for the book that you bring up when someone says they want to get back into reading. The one you don't think ever gets enough attention because something else in that genre became popular. The one where people say "that was a book?" after discovering a movie or tv show they enjoyed was based on a novel.

My list starts with Howls Moving Castle, my own personal choice, that I have actually recommended to anyone asking.