Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Shaggy-dog story

Well-written mystery-thriller keeps you involved at the beginning. But it is historically misleading, often inaccurate. You put up with too much overt pagan proselytizing and are let down by an unsatisfying denouement to the mystery of "the Grail." I advise against wasting your time on it. If you have sufficient knowledge of history of art or of religion, you will be aggravated. If you don't, you are likely to be deceived!