SPOILER ALERT: So do not read unless you have read Blood of Olympus. (Duh!) After blowing Gaea to obliteration, Leo dies and comes back to Ogygia to save Calypso. They try to make their way back to camp, but old grudges are still being held. Enemies have not forgotten. And when one of them comes back for revenge, Leo and Calypso are hurled into one of their most dangerous challenges yet. In the meantime, the rest of the seven are frantic. They beat Gaea, but their victory came with too high a price. But six months after the battle, they begin getting signs and visions of their lost hero. Could Leo really be back?