Artemis Fowl and the The Atlantis Complex (Artemis Fowl, Book 7)

Dabbling in fairy magic has led Artemis Fowl to develop the Atlantis Complex (aka multiple-personality disorder). And now, with the subterranean city of Atlantis under attack from vicious robots, he is too nice to be of use to anyone. Can Holly get devious Artemis back before they strike?