The Eternity Code

Artemis Fowl, a gifted young Irish schemer, has built a powerful computer from technology he took from the fairies. Put into the wrong hands, such a machine could endanger people and fairies alike. Artemis, however, has no intention of switching it on. His real target is an American entrepreneur with links to the Mafia, and he means to show him the machine.

This is the third book in Eoin Colfer's Artemis Fowl series. It keeps the focus on Artemis, a boy with a genius-level intellect and a talent for manipulation, and on his uneasy dealings with Captain Holly Short, a fairy officer from the underground police force, and Butler, his loyal bodyguard. The story is set against the backdrop of Artemis's family home in Ireland and the hidden fairy world beneath it.