To prevent the Shadow Dragon from plunging the world into sky-shadow the Drake and Darma seek out a Light Dragon named Lysa, but they learn from her dragon master they need to summon a Star Dragon with a star flute, hidden within a dangerous labyrinth.

When demonic cheerleaders invade his high school, Percy Jackson hurries to Camp Half Blood, from whence he and his demigod friends set out on a quest through the Labyrinth, while the war between the Olympians and the evil Titan lord Kronos draws near.