The tale is set in the mid-2000s and features Perseus "Percy" Jackson. He is a 12-year-old boy who learns that he is the son of the Greek god Poseidon. Because Zeus, Poseidon, and Hades had sworn not to father any more children after World War II, Poseidon didn't interact with him as a child. The gods took that pledge because their children were too strong and had the potential to cause immense slaughter (in the universe's continuity, World War II was a conflict among their offspring). When Percy learns that he is at risk for being found by ferocious monsters because of his demigod status and strength he also learns that Camp Half-Blood, a training facility on Long Island, New York, houses more demigods like him.
He journeys with new friend Annabeth Chase, a daughter of Athena, and best friend and traveling companion, Grover Underwood, a satyr who is his guardian. As the threat posed by the Titans grows, Percy begins to complete remarkable tasks, fulfill predictions, and engage in combat with and for the gods. He realizes that he can either contribute to the world's destruction or its preservation.
