This new book in the Artemis Fowl series succeeds at moving the story forward and introducing some new and important elements. As if it was not enough with all the different magical creatures, such as fairies, elves, goblins and dwarves, now we get to meet demons and warlocks. These two species are also associated with quantum leaps in time and space, which introduces a level of complexity in the plot that is hard to grasp. Trying to understand the logic behind this process will prove to be challenging to say the least, and Colfer says it clearly in his own words: "Time quandaries such as these should be forgotten for the sake of sanity". Following this advice will allow for a more enjoyable read. The aspect of the plot that I found to be revolutionary and enthralling in this book has to do with the introduction of the character of Minerva. She is a female version of Artemis, a couple of years younger but with a similar level of intelligence and resourcefulness for obtaining what she wants. When Minerva crosses paths with Artemis in their mutual search for a demon, hidden emotions arise and sparks fly all around. Holly and Butler will naturally take part in the events that unfold, as will Minerva's dangerous and unstable bodyguard. This installment is not as fast-paced as some of the previous ones and the fact that Mulch only has limited participation in the story, as does Foaly, reduces the opportunities to introduce the usual humor we have come to expect from this series. The book is nevertheless interesting and fans of the series will definitely have a good time.