Percy Jackson is a demigod son of Poseidon. He trains at Camp Half-Blood a summer camp for children of gods. Luke Castellan stands as the betrayer in the tale. a demigod son of Hermes. Mythical foes such as Medusa and the Minotaur are among their encounters. The central quest is to recover Zeus's stolen lightning bolt. He is accused of stealing the bolt. Allies help him through the quest.