Percy Jackson is a demigod son of Poseidon who discovers his true identity at Camp Half-Blood. He is accused of stealing Zeus's master bolt and must go on a quest before the summer solstice to find it and prevent war between the gods. Along with his friends Annabeth and Grover, Percy travels to the Underworld and rescues his mother from Hades. They learn that the enemy demigod Luke framed Percy by hiding the bolt in his possessions. Percy retrieves the bolt and proves his innocence, saving Olympus from conflict.