When I grade your essays on the outside readings I will look to see what your thesis is and then look to see how well you prove it. You need to do the same thing with this book. In your first page or so tell me what the book is trying to prove. Then tell me if you think they have proved their thesis or not, and what evidence in the book makes you think this. You don't have to entirely agree or disagree with the author.
Most students come down in the middle somewhere, which is fine.
There is no right or wrong 'answer' to this paper. As long as you make it clear what the book is saying and what you think about it and why, you will do fine. Your review should be typed, double-spaced, and have a real title. You should provide the title of the book, the name of the author, the publisher and the year of publication. If the paper is turned in on time and all the other requirements have been met you will have the option of revising the paper for a higher grade.