Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent Spy Novel

Greenmantle is a dramatic and suspenseful story of 4 men journeying through enemy lines to stop an evil menace that may crush Britain during WW1.As you read you will be able to tell that John Buchan knew what he was writing about! The characters and the plot are very well developed and sometimes rather confusing but if you just keep reading it will clear up. Buchan sometimes gets technical and you may have to look up some phrases/words in the back but this book is worth it. I would recommend it for 11th grade +. Once you start it you may not be able to put it down so enjoy!