Percy takes the master bolt back to Zeus on Mount Olympus, who rewards the young hero by not killing him. Percy returns to Camp Half-Blood as a hero and enjoys the rest of his summer there. On the last day of camp, however, he goes into the woods with Luke, who reveals himself to be the real thief of Hades's Helm and Zeus's bolt, following the orders of Kronos. Kronos also manipulated the power-hungry Ares into taking part in the scheme. Luke explains his beliefs that the gods are too irresponsible and are poor leaders who need to be overthrown. He offers Percy the chance to join him, and when Percy refuses, Luke tries to kill him with a scorpion. Percy manages to kill it but is badly poisoned and faints. When he has awakened and recovered, Percy is given the choice of whether to return home for the school year or stay at camp year-round. After much thought, he decides to spend the school year with his mother, even though it will be more dangerous for him with Luke and Kronos on the loose. Grover and Annabeth also leave the camp for the year but promise to keep in touch with Percy.