Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Rare Gem

As a rule, I don't give five star ratings that often. I feel they need to be saved for the truly spectacular works that truly deserve it. This book meets the bill for me. It is easily the best book I have read in ages. I finished it three days ago, but I am still running it through my mind. They say that the truth resists simplicity, and this work exemplifies the adage. Layer after layer pulled back, but the full picture doesn't emerge until the end. Masterful and haunting.