Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Badly unbalanced

Knightley's book, while interesting in places, is very much a "child of its time": he uncritically repeats many of the more shrill and naive arguments made by the Left against intelligence services in the 1970s. If you already believe that intelligence agencies are a complete waste of time and money, you'll love this book. If you'd like a mature discussion of the merits, demerits and dilemmas of intelligence work in the real world, look elsewhere.