The gods of Olympus are alive in the 21st Century. They still fall in love with mortals and have children who might become great heroes, but most of these children meet horrible fates at the hands of monsters by the age of 12. Only a few learn the truth if their idenity and make it to Half Blood Hill, a Long Island summer camp dedicated to trining young demigods. Such is the revlation that lsunches young Percy Jackson on a quest to help his real father, Poseidon, avert a war among the gods.