Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Flat Ending

Changes of Heart was good enough to hold my interest until the last chapter. Then all of a sudden it was as if the publisher called and said, "We need that manuscript tomorrow." The heroine even chose the wrong man according to my expectations, and her reasons are left a complete mystery. I went back and reread several pages to see if I had missed something--to no avail.