Artemis Fowl: The Time Paradox

Artemis Fowl's mom is deathly sick. He tries to use some magic to heal her. Too bad he fails. And he loses the magic ability he gained as well. The disease is identified. Only some fluid from a certain type of lemur can cure his mom. But they have been extinct for many years.

Artemis enlists the help of his pixie friend Holly. Together they travel back in time. It just so happens that a younger Artemis had sold the last lemur of its kinds a long time ago. Artemis and Holly need to go back, steal that lemur from Artemis' younger self, and return to the present.

They run into some trouble. Another evil pixie has determined that if she gets the lemur, she can obtain ultimate power. They also need to deal with an evil man who wants to kill the lemur to end its race. We meet 10 year old Artemis in the past. He is just as crafty as the Artemis of today. This makes the theft extremely difficult.