Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Timeline

Timeline is a great book that explodes with energy from the very beginning. It is about a group of historians who travel back in time to bring back their professor. From the very start, things go wrong. The two guides are killed in their first minutes of getting there and the only machines they have to get back in are destroyed. In a race against time they rescue the professor and manage to bring him back safely. The book is very fast paced and interesting.The theme of this book is to never hold back and always finish what you start. I liked the characters a lot. There were a lot of characters to remember, but it wasn't too confusing. I thought the book was very well written and would recommend it to anyone.