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.

""There is a secret coded message that runs along the bottom of this book. Can you crack the code?""--T.p. verso. Contains an excerpt from Colfer's novel Airman.