Amazing. At last a book that lives up to the hype. This is what I think Danielewski was trying to do with House of Leaves, but Egan has made a dream construction real. I don't want to go into too many spoilers, but their is a scene to watch out for where Egan throws a hook we (well, I) had completely forgotten about; and if that scene doesn't make your scalp crawl,well, you're not a person whose scalp can be made to crawl, and I feel sorry for you. If you want stories about upper middle class couples going through painfully slow marriage break-ups (which seems to be the defaul mode for 'literature' at the moment), you probably won't enjoy the keep. But if you love a good Lynchian dream sequence and a spiral staircase,this is unmissable.