Carter and Sadie Kane, descendants of the magical House of Life, are in pretty big trouble. Despite their bravest efforts, Apophis, the giant snake of C haos, is still threatening to plunge the world into eternal darkness. Now the Kanes must do something no magician has ever managed - defeat Apophis himself. No pressure there then. Battling against the forces of C haos, their only hope is an ancient spell - but the magic has been lost for a millennia. Will they find the serpent's shadow, or will they be led to their deaths in the depths of the Underworld?