Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Heart-rending

The most heart-wrenching book I have ever read. Superbly but unobtrusively crafted, it a story of love, betrayal, guilt and redemption in the context of modern Afghanistan - from the time before that unhappy country was plunged into chaos until the time of Karzai. The personalities above all; the portrayal of Afghan society at its best and at its worst, both at home and in the diaspora; the picture of the war-torn country - all these are quite unforgettable. The author is an Afghan refugee living in America, and one suspects a strong autobiographical element.