When demons begin appearing on Earth unpredictably, foreshadowing a catalysmic breakdown of their magic, Artemis and his friends face a new foe -- a twelve-year-old girl whose intellect just might match Artemis' own -- as they try to prevent catastrophe. Once again, Artemis will have to pair up with his old comrade, captain Holly Short, to track down the missing demon and rescue him before the time spell dissolves and the lost demon colony returns...