Artemis Fowl: The Eternity Code is the third book in the unbelievably brilliant Artemis Fowl series by Eoin Colfer.

CAN ARTEMIS FOWL LEAVE HIS CRIMINAL PAST BEHIND?
Not quite. At least, not yet. He's got one last job, and then he's going to be good.
But the job goes horribly wrong. So wrong in fact that now a nasty, ruthless billionaire has stolen Artemis's latest invention - a powerful super-computer that could put the entire fairy world at risk.
Holly Short is going to be furious.
Artemis must retrieve the stolen technology. He needs help. He needs the fairies. He's got some apologising to do . . .