Octavian tells Percy that the Book of Prophecies is missing. Being outcasts themselves at Camp Jupiter, Frank and Hazel empathize with Percy's outsider status and consider it their duty to help him adjust and acclimatize quickly to the camp's routines and leadership. But before any of them has a chance to gain their footing, they are ordered to go on a quest to rescue Thanatos, the god of death, from the Giant Alcyoneus who is hiding deep in Alaska after receiving a direct prophecy from Mars, the Roman god of