The final book in the series, Artemis Fowl: The Last Guardian will be released July 10, 2012. Eoin Colfer has revealed some of the plot line of the book: a portal, behind which dwell the spirits of Fairy soldiers and which is located on Artemis Fowl's lands, will be opened by Opal Koboi, and the spirits will rise and possess the bodies of Artemis Fowl Senior, Angeline Fowl, Myles, Beckett, and others. It will be Artemis and Holly's job to get the spirits back into the portal before they rampage across the world.