Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A psychological thrill that keeps you guessing

A dark thriller both figuratively and literally. Morgan Freeman and Brad Pitt are two detectives coming from different backgrounds who blend nicely in their effort to find a serial killer who bases his murders on the seven deadly sins. Don't think things fall into place neatly as 'John Doe' promises his 'work' will be pondered and puzzled for years. Hollywood convention would have a happy, cuddly ending but writer Andrew Kevin Walker and director, David Fincher stuck to their guns and showed that a smartly done, yet shocking ending could perform at the boxoffice.