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.

Zeus the hamster and his cohorts escape their cages at Mount Olympus Pet Center in Athens, Georgia, to solve the mystery of the labyrinth--the center's duct system.