Hades later appears and reveals that Sally Jackson is his prisoner, and proposes she be traded for the master bolt. Chiron instructs Percy not to bargain with the god, but to go to Olympus to convince Zeus that he did not take the bolt. Percy sneaks away from the camp to travel to the Underworld along with Grover and Annabeth, who secure for him a portable shield from Luke, flying shoes and a map to Persephone's (Rosario Dawson) pearls, one of which will reveal the exit from the Underworld.