Percy Jackson is a hero who discovers his divine lineage. He trains at Camp Half-Blood the legendary training ground for demigods. Luke Castellan serves as the betraying foe. a demigod son of Hermes. Mythical foes such as Medusa and the Minotaur challenge Percy and friends. He must recover Zeus's bolt, accused of theft. He is accused of stealing the bolt. Friends accompany him on the journey.