Unfinished books?

I've read That Awful Mess on the Via Merulana which was incomplete, and I know that at least one other NYRB, James' The Ivory Tower is unfinished. Are there any others? Also, has anyone read The Ivory Tower? I love James, but am in general wary of unfinished works. Is it worth reading? (That Awful Mess didn't bother me, because the plot wasn't as important as the prose and structure)

I've ordered the Ivory Tower. I'll let you know how it was when I finish.