Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Deeply suspenseful mystery

A Stranger is Watching was a very suspenseful book containing many surprises. The characters were very entertaining, but some of them you could not understand. The plot was great, she always kept you guessing, and it includes some romance also. I recommend this book to anyone who loves a good mystery. You'll never figure it out until the end!