 In "The Hidden Oracle", Calypso comes to Camp Half-Blood with Leo and reveals that, due to her choice to leave Ogygia, she has become a mortal.She accompanies Leo and Apollo in the latter's quest to find the Oracles and stop the Three Emperors from conquering North America.Despite this, the two secretly attempt to find a normalcy for their lives and later announce to Apollo that they are going to settle in Indianapolis, although they will continue to help him anyway they can.