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I absolutely loved Wool by Hugh Howie and maybe my expectations were too high afterwards, but Sand fell a bit flat in the end. I enjoyed the beginning, the world building and the characters. Howie knows how to write. But in the end it feels like it's just the first part of something bigger and like there should be a second book. It's almost as if he hit his word count and stopped writing. If you don't mind abrupt endings it's well worth a read.