Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
Here is a terrifying novel by Cornwell. Her knowledge of medicine and forensic science keeps you turning the page. A woman's body is found in the snow in Central Park. There is no question that the killer is one Temple Brooks Goult. Scarpetta discovers that his killings are a pattern with one ending. It is one of her best. By Ruth Thompson author of "The Bluegrass Dream"
Answer:
Positive