A fairy criminal mastermind is trying to gain unlimited power, and possibly also take over the world while they're at it, again. The only person able to stop this plan, Artemis Fowl, has lost it due to a psycological condition called Atlantis Complex, going paranoid and avoiding the evil number four of death. To make matters worse, when the world needs him most, Artemis is forced out of his own mind, leaving his body controlled by Orion, his alter ego created by the Atlantis Complex. Now, Artemis will have to fight not only against the evil mastermind, but also for control of his own mind.

Artemis Fowl’s project to save the world from global warming is shattered – literally – when amorphobots crash-land on the glacier where he’s presenting to Captain Holly Short, Foaly the technician and Commander Raine Vinyaya of the LEP. To make things worse, the Atlantis Complex renders Artemis useless; he’s certain the number four equals death and believes the bots aren’t real. Once Holly electric-shocks him, Artemis’s alter ego, Orion, arises, who insists he’s in love with Holly. They must use an escape probe and meet up with Butler, Juliet and Mulch Diggums, who also need to battle for their lives. Under the sea, they race to catch up with an evil relative of the late Commander Julius Root before he can kill thousands of innocent Atlanteans. (excerpted from http://www.yahongchi.wordpress.com)