"Opal Koboi, the power-crazed pixie, is plotting to exterminate humankind and become fairy queen. If she succeeds, the spirits of long-dead fairy warriors will rise from the earth, inhabit the nearest available bodies, and wreak mass destruction. But what happens if those nearest bodies include animals, or two curious little boys named Myles and Beckett Fowl? Can Artemis and Holly stop Opal and prevent the end of the world?"--

After Artemis uses stolen fairy technology to create a powerful microcomputer and it is snatched by a dangerous American businessman, Artemis, Juliet, Mulch, and the fairies join forces to try to retrieve it.

When a twelve-year-old evil genius tries to restore his family fortune by capturing a fairy and demanding a ransom in gold, the fairies fight back with magic, technology, and a particularly nasty troll.