Artemis Fowl (Artemis Fowl, Book 1) by Colfer, Eoin [2001]

Twelve-year-old Artemis Fowl is a millionaire, a genius-and, above all, a criminal mastermind. But even Artemis doesn't know what he's taken on when he kidnaps a fairy, Captain Holly Short of the LEPrecon Unit. These aren't the fairies of bedtime stories-they're dangerous! Full of unexpected twists and turns, Artemis Fowl is a riveting, magical adventure.