Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: A valuable book

As a military man, I am always interested in the people who make up what we call the "National Command Authority." And that is why Blackman's book is so valuable. Before reading it, I saw Albright as a cardboard cartoon. But Blackman acts like a life-saving doctor, placing an oxygen mask over the secretary of state, putting the rose into her cheeks, a twinkle into her eyes and showing the real heart of American foreign policy today. A wonderful book!