Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Harry Potter and the Half-Blood Prince (Book 6)

This was a fast moving book with lots of character development and twists in it. While we enjoyed it, we were also saddened by the ending. We are eager to get to book seven in the hopes that J. K. Rowling will keep the faith with the reader and twist the plot into one that will make us want to continue reading the books over and over again. Because we have enjoyed these books so much we have them on CD and tape so we can listen to them while we are taking trips in the car. Seattle to Kansas City and back again with Harry Potter.