Instruct: Classify a given review into positive or negative sentiment.
Query: Spies , Counterspies and Deadly Games They Play

This book is absolutely riveting, better than a novel on the same subject. The authors have done exhaustive research, interviewing many of the key players, surviving spouses, co workers, friends and sometimes enemies of the subjects of this book. Having spent almost 6 years of my life in the US Air Force's Intelligence system, I was aware of some of these mysteries, but the details, conclusions and unknowns in these stories will make the reader gasp for breath in the audacity of these spies, then weep with frustration at how these spouses are left to twist slowly in the wind for lack of certainty about what happened to their loved ones who engaged in this most deadly of games.