Thirteen-year-old Artemis Fowl has constructed a super computer from stolen fairy technology far more advanced and expensive than anything we have now. This computer is called the C Cube, and it has been stolen by the American billionare, Jon Spiro. With the C Cube in his hands, Jon Spiro shall be invincible, and is bound to find the fairies. Once again, LEP captain Holly Short, LEP commander Julius Root, kleptomaniac dwarf Mulch Diggums, LEP technist Foaly, Artemis, Butler, and Juliet must join forces to prevent the human and fairy worlds from colliding, and to avoid a global horror.

This is the third book to the 39 Clues: Cahills vs Vespers series. Amy and Dan travel to Samarkand, Uzbekistan and follow the now dead Ulaug Beg in order to find the next ransoming secret for the Vespers. Now with Dan's best friend Atticus Roosenbloom and his older brother, Jake, on their side, the Cahills feel as they can find the next item in time to save their uncle, the chosen hostage to be shot. But Dan and Amy don't know exactly what they're looking for.

It has been a year since the Artemis Fowl Incident, abduction and ransom of LEP recon officer Holly Short, led by the notorious, brilliant, twelve-year-old Artemis Fowl the second. But there is new havoc in Haven City. Someone -a human- has been selling batteries to half-witted goblins with soft-nosed lasers, and Holly Short is on the case. Immediatly suspecting Artemis, Holly returns to Fowl Manor to consult and accuse Artemis. But Artemis has his own problems. An e-mail is sent to him from Russia, an e-mail featurng his dying father. He is sure a ransom will be sent soon. Now, for the first time, Artemis and the LEP must work together to prevent the Lower Elements and the human world from colliding, and to save Artemis' father. But these are uncharted waters, with unsuspecting enemies and traitors.

It has been a year since the Artemis Fowl Incident, abduction and ransom of LEP recon officer Holly Short, led by the notorious, brilliant, twelve-year-old Artemis Fowl the second. But there is new havoc in Haven City. Someone -a human- has been selling batteries to half-witted goblins with soft-nosed lasers, and Holly Short is on the case. Immediatly suspecting Artemis, Holly returns to Fowl Manor to consult and accuse Artemis. But Artemis has his own problems. An e-mail is sent to him from Russia, an e-mail featurng his dying father. He is sure a ransom will be sent soon. Now, for the first time, Artemis and the LEP must work together to prevent the Lower Elements and the human world from colliding, and to save Artemis' father. But these are uncharted waters, with unsuspecting enemies and traitors.