On GoodReads we do need percentages or disc numbers to indicate "reading" progress (I have seen the former for some books but not this one.) I don't think what follows is a spoiler:
I am on Disc 15 of 20 and ... cognizant of the need not to spoil ... I will say, simply, elements remind me of Cool Hand Luke and One Flew Over the Cuckoo's Nest.
Finished now: excellent book. Not a favorite of mine but excellent nonetheless.