The story follows Percy Jackson as a demigod son of Poseidon. He attends Camp Half-Blood a summer camp for children of gods. The main antagonist is Luke Castellan. a demigod son of Hermes. Monsters like Medusa and the Minotaur test the heroes' courage. The central quest is to recover Zeus's stolen lightning bolt. He is accused of stealing the bolt. Allies help him through the quest.