This is a brilliant book, really! Colfer's best one yet! It's very in-depth, action-packed, and all the other hyphenated words I can think of.. forty-two? lol. Just kidding.
I did find a few parts to my dislike, the Julius Root incident, for one, and the troll scene was icky. I don't like trolls. But other than that, I like the book. The audio book is even better, I might add.
I am also glad that chocolate truffles played a major role in The Opal Deception. lol.