After his escape from the sentient prison, Incarceron, Finn finds that the Realm is not at all what he expected, and he does not know whether he is to be its king, how to free his imprisoned friends, or how to stop Incarceron's quest to be free of its own nature.

Deep beneath London, five extraordinary youths, orphans who bonded over their shared sense of justice, have formed the Urban Outlaws and dedicated themselves to outsmarting criminals and performing Random Acts of Kindness (R.A.K.s), but they are in serious trouble when the face a genius super-computer, Proteus.

"In 2001, Eoin Colfer published Artemis Fowl, a hilarious and rip-roaring science-fiction/fantasy adventure about a twelve-year-old criminal mastermind who kidnaps a fairy, Captain Holly Short of the LEPrecon Unit. But these aren't the fairies of bedtime stories; these fairies are armed and dangerous. Artemis thinks he has them right where he wants them... until they stop playing by the rules. The novel was an instant sensation and became the start...