Eoin Colfer: This is the seventh Artemis Fowl book written by the Irish author.
Out 7 August
Artemis Fowl is a very wealthy criminal mastermind who has unlocked a world of fairies and magic.
There are two versions of him in his book: Elder and Younger.
Both have a huge minder called Butler. His sidekick is Captain Holly Short, a very capable police fairy who has hypnotic skills and an amazing range of gadgets.
There are a host of other characters, all extremely important to the book, including a number of superb villains.
Artemis Fowl is back, but he must face his deadliest foe yet...his younger self.
His mum is very ill, and to make her better Artemis the elder has to go back in time and track down a rare monkey.
The only problem is that he has to steal it off a younger version of himself.
And things don't go according to plan.
The James Bond-like showdown in the leather souk in Fez is really thrilling.
So is the confrontation at the annual Extinctionists' banquet with the extremely nasty Dr Kronski and his cronies who have a real hatred of the animal kingdom.
Mulch Diggins, a dwarf who assists Artemis, is a real hoot.
Any weak bits?
If this is the first Artemis Fowl book you read, you might find it hard to understand as there are a lot of characters to get used to.
It might be easier to read the first Artemis Fowl book or the graphic novel first.
It is difficult to get going if you haven't read any of the other books and the first few chapters drag.
Things really start to liven up when they go back in time and try to steal the monkey. From the bit in Morocco, the book is virtually impossible to put down.
This reviews page is now closed. Here are some of the reviews you sent in.
"This book is absolutely amazing!! Loved it!!"
Lauren, 12, Cornwall, England
"It was by far the most exciting book I have ever read. It made me think about time, really interesting. Everyone deserves to read this!"
Ayesha, 13, Brighton, England
"The ideas in the book were really interesting - they made me think a lot about time and physics. I've recommended it to my science club. 9/10!"
Sonia, 14, Worthing, England
"I'm halfway through it at the moment, it's very gripping but can get confusing, I would say why but it'd give too much away."
Luke, 13, Australia
"A very good book but it got a bit boring towards the end."
Rupert, 12, London, England
"It was absolutely amazing, so original. I recommended it to my class and we all read it in Literacy."
Tasmin, 12, Brighton, England
"I loved all the books I read each one in a day, I can't get enough. The new book lived up to my expectations and more! Another great book from Eoin Colfer."
Nayyar, 13, Harrow, England
"Fab! I couldn't put it down, the best book I have ever read by far!"
Bethan, 9, Birmingham, England
"Absolutely brilliant! A must have, by far the best book in the series!"
Bob, 11, Gateshead, England
"Perhaps the best book I ever read! 100%! 10/10!"
Ali, 10, Edinburgh, Scotland
"I need more sleep because I keep reading it! It's so gripping I can't put it down!!!!"
Lara, 10, Braintree, England
"My favourite Artemis Fowl so far! Absolutely fantastic, a definite 5/5. The plot was amazing, it was impossible to put down!"
Izzy, 13, Birmingham, England
"We have all the Artemis Fowl books, apart from the graphic novel, and as soon as The Time Paradox came out we immediately bought it. We loved it, as we do all of them!!"
Emily, 11, Scotland
"I agree with Jonathan, it can be hard to understand. However, it's a good book and deserves to be treated as such."
Miranda, 11, UK
"I loved the other books, especially the fourth and fifth, but I thought The Time Paradox was a let down. Butler and Foaly were barely in it and Holly displayed no emotions bar fear. It is also harder to understand and the plot is predictable."
Hannah, 12, Surrey, England
"I've read all the Artemis books, and this is one of the best. It is un-put-down-able! The only weak bit is that it can get confusing. I really recommend it (read the others first)."
James, 11, Edinburgh, Scotland
"I have really enjoyed reading all the Artemis Fowl books, and this one wasn't a let down! It was one of my favourite books in the series and I would recommend it to anyone!"
Emma, 13, Essex, England
"The best in the series; very clever and you can't put it down from start to finish."
Liam, 13, Rhondda, Wales
"It's a really good Artemis Fowl story, but it takes some time to pick up and doesn't have as much action as the previous ones."
Jonathan, 14, Southampton, England