Artemis Fowl Book 4.
To all appearances, Opal Koboi, pixie and archenemy of the fairies, is under close surveillance as she lies in a coma. Artemis Fowl, the brilliant 14-year-old criminal mastermind, has had his mind wiped clean of all knowledge of fairies, and, therefore, of all prior goodness he has learned. When the real Opal escapes and leaves behind a DNA-perfect clone of herself, her revenge against all those who opposed her commences with deadly fury.
This book is jam packed with action, gadgets, and funny sequences. Opal is a real bad fairy…and she doesn’t care if you know it! Artemis has his work cut out for him, especially when he’s trying to figure out what is going on. Good! – Jessica, Teen Librarian