Instruct: Classify Amazon reviews into positive or negative sentiment
Query: FLASH! A Review of "Lightning."

Lightning is, without a doubt, my favorite book by Koontz. The whole concept of time travel has always fascinated me. Koontz really brings a fresh look at time travel to the reader. The main characters are wonderful. Laura - As you "see" her grow up throughout the book, you begin to feel that you know her as the girl next door. You are able to see your own frustrations and feelings in her. Stefan - He is doing what everyone wishes they could. Trying to find, and protect, that one true love by doing anything he can within his power. His sincerity will no doubt mirror your own. This book is a work of art. It would be worth your while, even if you are not a big fan of science fiction novels.