"Almost everyone can name at least one author that you would love just ONE more book from. Either because they’re dead, not being published any more, not writing more, not producing new work for whatever reason . . . or they’ve aged and aren’t writing to their old standards any more . . . For whatever reason, there just hasn’t been anything new (or worth reading) of theirs and isn’t likely to be.
If you could have just ONE more book from an author you love . . . a book that would be as good any of their best (while we’re dreaming) . . . something that would round out a series, or finish their last work, or just be something NEW . . . Who would the author be, and why?"
I can think of three authors who have passed away - Ellis Peters (pen name for Edith Pargeter) and her Brother Cadfael mysteries, James Michener with his awesome volumes that combined history & fiction so seamlessly, & Robert Heinlein, the Dean of Science Fiction and author of Stranger In A Strange Land, I Will Fear No Evil, & (my all time favorite) The Moon Is A Harsh Mistress.
I think I've read every book that Heinlein ever wrote (with the exception of Job, A Comedy of Justice which I just couldn't get into despite several attempts) and many of them two, three & even five times.
I've read all the Brother Cadfael books - and enjoyed the episodes for Mystery on PBS with Derek Jacobi as Cadfael. Edith Pargeter also wrote The Heaven Tree Trilogy under her own name which was excellent.
James Michener's books are legendary. My personal favorite is Hawaii which I read (along with Exodus) the week of my high school senior finals. There are still a couple huge volumes on the shelves in the other room that I'm saving - sort of like desert.
So, to chose just one book by one of these authors? That's difficult, but I think I'd have to chose a new Heinlein, maybe a follow up the TMIAHM.