This book has, in my opinion, a surreal quality. I can't speak about it in the artistic terms used by some of your other reviewers. I didn't consider what it had to say about man's condition. I only know it was fascinating to read, a story which you felt was written in pictures, and I don't mean that it is a graphic novel! (if you like graphic novels you probably will NOT like William Golding).
The dean, Jocelin, is a man with such religious faith that he ignores sense and the warnings of his master builder and others. He goes ahead and adds a spire to a cathedral whch had never been built to support a spire. The result throughout the book is not a dry, technical account of the construction process, although there are plenty of references to real-life engineering to keep you happy if you are interested. It is not about religion, either. Mainly this book is about obsession and blind faith and above all, about people. The tension builds throughout as you will Jocelin on to further indiscretion for the sake of the drama.Your nerves tighten like the overloaded "screaming stones". It doesn't spell out every action in a he-did-this-and-then-she-did-that fashion. Golding does't write in that way. But if you like to have your brain stirred up a bit, to have to think a bit when you read, then this is for you.
I don't think that you have to read Golding's other books to appreciate this one, as someone suggested. You either love Golding or you don't get along with him. My wife can't read most of his books. I believe that The Spire may be his best book.
Actually, I've read it several times. I don't mind admitting that I am still not sure if the spire collapses or not. It just doesn't matter. Perhaps Mr Golding was having a laugh at our expense. He knew that we would waffle amongst ourselves about the underlying meaning of it all, when there is just a good story. Whether the spire stays or falls is not the point. You could do worse than read it and try to work it out for yourself.