I asked the question because I have mixed reactions to the whole idea. I can only think of one such sequel (and it was a continuation of an unfinished story) that I thought was very good. Well, I do remember one other, but I read that when I was nine or ten, so perhaps my critical faculties were a bit at fault back then.
And having been disappointed by some books where I really thought that the combination of old story and new author had an excellent chance of working, I suspect that I always would be disappointed by a sequel to something I genuinely loved.
But still, there is a small part of me that hopes, that would take a look at such a book, just in case ...
JD, I was thinking about some of the Sherlock Holmes stories by other hands when I started the thread. Even though I've never found one that caught the flavor of the original, it would be impossible for me to dismiss some of those writers as hacks. Their own stories are far too good.
As for the Jane Austen sequels that Ian mentions, I've started two that were written by Jane Aiken -- whose children books I love -- and disliked them to the point where I couldn't finish. I wouldn't even pick up any of the others, since I know how difficult it is to do that period right.
Well, OK, if Susanna Clarke wrote an Austen sequel, I'd probably be eager to give it a chance.
But if almost everyone here condemns this sort of thing as picking over old bones, does the same thing apply to novels that reimagine another writer's characters and world?
Is Gregory Maguire automatically branded as a hack for writing Wicked and Son of a Witch? What about Isabel Allende for reworking Zorro? I didn't like any of these books, but it would be hard for me to dismiss the writers as talentless, or incapable of producing anything of merit. Particularly Allende, who is a highly respected author with an international reputation.
On the other hand, The Looking Glass Wars, by Frank Beddor is, in my humble opinion, hackwork at its most despicable.