Artemis Fowl and the Time Paradox by Eoin Colfer

Artemis Fowl is no stranger to trouble. In fact hes a magnet for it. Maneating trolls armed and dangerous not to mention hightech fairies flamethrowing goblins hes seen the lot. He had decided to forego criminal activity of the more magical kind. However... Now his mother is gravely ill. Paperback softback