Artemis Fowl series

Teenaged criminal mastermind Artemis Fowl must save the underwater fairy metropolis of Atlantis from danger, while battling a psychological affliction known as the Atlantis Complex.

Criminal mastermind Artemis Fowl has no memory of the fairy people and his dangerous enemy, Opal Koboi escapes from jail and is planning revenge.

Artemis's mother has contracted a deadly disease -- and the only cure lies in the brain fluid of African lemurs. Unfortunately, Artemis himself was responsible for making the lemurs extinct five years ago. Now he must enlist the aid of his fairy friends to travel back in time and save them. Not only that, but he must face his deadliest foe yet...his younger self.

Hoping to destroy humanity once and for all, Opal Koboi devises her most deadly scheme yet, one that involves the release of fairy spirits that will serve her without question. Now, Artemis Fowl must once again join forces with the fairy people to thwart her plan.