Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Powers guides the reader to an epiphany

This book seems, for quite a while, to be more modest, more confined to interpersonal relations than Powers' other books. Then, suddenly, the reader's mind explodes with the realization of just what the Prisoner's Dilemma is, the realization of the scale of the human problem that Powers wants us--and the characters of the family that are the novel--to confront. This book is not light, casual entertainment, despite the humor that enters throughout. It is a book one cannot forget.