ARTEMIS FOWL IS NO STRANGER TO TROUBLE. IN FACT, HE'S A MAGNET FOR IT.   Man-eating trolls, armed and dangerous (not to mention high-tech) fairies, flame-throwing goblins – he's seen the lot. He had decided to forego criminal activity of the more magical kind. However . . .   Now his mother is gravely ill. He must travel back through time to steal the cure from the clutches of the devious...