This is an old thread, but I'm using it as an opportunity to shill an article I wrote for LitReactor on "professional" versus "amateur" fan fiction.
I talk a bit about David Thomson's Suspects in the article, but I don't get into too much nitty gritty because the beauty of the book is how it twists and turns your expectations from prior movies. If you haven't read it, it's a series of biographies of famous movie characters from Noah Cross to Travis Bickle that continue on after the movies end, and make connections between the characters. It's basically the Marvel Cinematic Universe of classic Hollywood cinema.
So has anyone read it? Because I enjoyed it very much and would like to talk spoilers if anyone is interested.