Those who have been faithfully following this series will know that this is book six of the adventures of the teenaged criminal mastermind, Artemis Fowl II.
Picking up at Fowl Manor, we learn that three years have passed while Artemis was otherwise occupied, and that he now has two brothers, twins named Beckett and Myles. This book goes in a different direction to the previous plot, making no mention of some of the characters introduced in The Lost Colony. There are references to certain events, but other than the main characters, most of the story is new material.
As the title implies, an older and more mature Artemis Fowl enlists the help of his friend Captain Holly Short, dwarf Mulch Diggums and the imp warlock No.1 to journey to the past to correct a mistake he made earlier in his eventful life. His mother has contracted a rare disease that can only be cured by an extract from the brain of an extinct lemur, and ironically, the extinction was hastened by young Fowl himself.
The time trip gets very complicated when Artemis matches wits with his younger self, and rescuing the lemur from Dr. Damon Kronski, leader of the Extinctionists cult, proves to be much easier planned than achieved. To make it more complicated, there's now a fledgling romantic situation in play, and the return of an enemy from the past who also wants possession of the lemur.
Artemis isn't as devious and diabolical as in earlier books, but to his credit, the kid is growing up and has other things on his mind. This book is action-packed with the usual gadgetry and humor, but as is the case with time paradoxes, it is sometimes hard to keep things straight. The plot also has several twists, obviously getting even twistier in the final chapters. The story ends with an obvious hint for another book.
And "What about the Kraken?" you may ask. Well, that part of the story is explosive, to say the least.