In his second adventure, the youngest, brightest, and most dangerous criminal mastermind is at boarding school when he receives an urgent e-mail from Russia. It's from a man Artemis never thought he'd see again: his father, who has been kidnapped by the Russian mafia and pleads for Artemis's help.

Ten thousand years ago, humans and fairies fought a great battle for the magical island of Ireland. When it became clear to the fairy families that they could never win, they decided to move their civilization underground and keep themselves hidden from the humans. All the fairy families agreed on this, except the 8th family, the demons. The demons planned to lift their small island out of time until they had regrouped and were ready to wage war on...

Artemis has committed his entire fortune to a project he believes will save the planet and its inhabitants, both human and fairy. Can it be true? Has goodness taken hold of the world's greatest teenage criminal mastermind? Captain Holly Short is unconvinced, and discovers that Artemis is suffering from Atlantis Complex, a psychosis common among guilt-ridden fairies -- not humans -- and most likely triggered by Artemis's dabbling with fairy magic....