Artemis Fowl by Eoin Colfer
I just finished reading all the books that I know of that are in this series, which is 7 total, and I loved them!! Artemis Fowl is a criminal mastermind, and he's only, like, 12! During one of his schemes, Artemis captures a fairy, or to be more specific, a LEP recon (Leprechaun, get it?) officer, the only female officer in the whole underground fairy world. A kidnapped fairy is no joke, and Artemis Fowl is the most wanted criminal in fairyland, which is all high-tech and top secret, not sugar plumbs and candy land. Going up against the best officers in the LEP, Artemis proves just how smart he is. He demands a lot of fairy gold as a ransom, and is put under attack as soon as the fairies send the gold in. Not really feeling very threatened, Artemis boasts that he knows how to survive the high-powered explosion the fairies want to send at Fowl Manor. Boasts or not, Artemis compromises and sends out the fairy gold with the fairy he kidnapped, who's name, by the way, is Hol