The Eternity Code by Eion Colfer is book 3 in The Artemis Fowl fantasy series about a genius criminal who is now 13 years old. Artemis used faerie technology to invent a cube well beyond any human technology.
Jon Spiro is an American Businessman who rivals Artemis in shady and definitely illegal business adventures. He outsmarted Artemis and stole the cube. Artemis and his team of faerie folk must go to Chicago and try to retrieve this cube.
The Eternity Code is probably my favourite of the Artemis Fowl books I’ve read so far. I found it much more suspenseful and page turning than the others. One problem I found reading this book as an adult is that this book now sets a precedent that all problems can now be solved with faeries and faerie magic. I think it’s only a problem as an adult reading it because I think the target audience will absolutely love how cool having magic is.
Good book but not one I would read without having read the other two because one theme of this book is how Artemis is maturing as a person. So you need to know how he started off (book 1 especially) to know where he is ending up.