Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Stop at #52

My daughter loved the Animorphs books #1 to #52. This book (53) she describes as very sad. The next book (#54) is really, really, really bad. My recommendation to parents is that they do not purchase 53 or 54 for their children, because ...*** Spoliers ***In this book, several popular characters die, the next book is worse. At the end of 54, everyone is enslaved to the evil villain. My daughter re-read the Animorphs books many times, greatly loved them, and after reading this book cannot enjoy any of them. Terrible shame. Very out of keeping with the rest of the series.