Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Gray and heartbreaking

The novel is about the despair and hope againgst knowing better of a father that wants to save his child in a world that has lost life and above all, it's civilization. There's hardly any indication of what caused this situation (probably a nuclear war) but that's not important. The description of the scenery is breathtaking. The world is all gray and covered in mist, with ashes being swept around by a cold wind. What remains of life are the stubs of burnt trees; what is left of civilization are the houses that they have to plunder in order to find food. Of course other survivers have plundered the same houses before them. The agony and despair of the father as their physical condition wears down are heartbreaking.In its grayness, a great book.