Artemis Fowl, the teenage criminal mastermind, has solved temporal equations that no normal human should be intelligent enough to understand. Even the fairy scientists cannot figure out where the next demon will pop up. When the spell’s deterioration accelerates, the materializations become unpredictable. The fairy Council are naturally concerned about this and are monitoring any materializations. Now, the tainted time spell is deteriorating and demons are being sucked back into the present space and time. However, the time spell went wrong, and the island of Hybras was catapulted into Limbo, where it has remained for ten thousand years. The demons planned to lift their small island out of time until they had regrouped and were ready to wage war on the humans once more. All the fairy families agreed on this, except the eighth family, the demons. 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. And she is just 12 years old.Ten thousand years ago, humans and fairies fought a great battle for the magical island of Ireland. There is someone else who has unlocked the secrets of the fairy world and managed to solve complex mathematical problems as only a genius could. So when a very confused demon imp appears in a Sicilian theater, Artemis is there to meet him. But he knows someone who can: Artemis Fowl. But in order to do so, they will have to decipher temporal equations so complicated that even a great brain like Foaly can't understand them. To protect themselves, the fairies must predict when the next demon will materialize. If humans were to find out about them, all fairies would be exposed.

Now the time spell is unraveling, and demons are beginning to materialize without warning on Earth.

There they have lived for decades, preparing to exact their violent revenge on humans. Rather than surrender, they used a magical time spell to take their colony out of time and into Limbo. When it became clear that they could not win, all of the fairies moved below ground, except for the 8th Family, the demons. Thousands of years ago, fairies and humans fought a great battle for the magical island of Ireland.

The Lost Colony by Eoin Colfer