The serpent's shadow / Riordan, Rick

When Apophis, the chaos snake, threatens to plunge the world into eternal darkness, siblings Carter and Sade Kane plan to use an ancient spell to destroy the snake, but first must rely on the murderous ghost of a powerful magician.

Carter and Sade prepare for the ultimate confrontation with the chaos snake Apophis at the same time the House of Life magicians launch a civil war, compelling the Kanes to tap the power of an ancient spell.