Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Time Travel with the Animorphs

This is my favorite of all of the books in the Animorphs series. The Animorphs go back in time chasing Visser Four to restore their timeline to normal. The price for being able to follow the Time Matrix is terrible, however,...one of their number must die. I love how the author works through the time travel scenario and how she focuses on how the slightest detail can change so much more than one would think.