Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Gripping, Informative, a Real Page-Turner

This book is far more than a whodunit. It is a wonderful history of the politics and pop-culture of the 1960s and 1970s and it provides in-depth character analyses of all of the central players. This one really puts "The Age of Aquarius" in perspective! Was the Unicorn a murderer or framed by secret operatives? The revelations in the last chapters provided an unequivocal answer for me.