"Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself."--Volume 1. "Demigod Percy Jackson, and his new friends from Camp Jupiter continue to try to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled."--Volume 2.