Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

Having read Perez-Reverte's other novels (my favorite still is Flanders Panel), I was rather disappointed with his newest novel. Yes, the story is interesting and research amazing. However, the characters were too flat and the plot too obvious. What happened to the great plot, twist, shock? I am sorry to say that I was disappointed with this book - but do highly recommend his other books!