A New York Times BestsellerThough the Greek and Roman crewmembers of the Argo II have made progress in their many quests, they seem no closer to defeating the earth mother, Gaea. Her giants have risen, and they must be stopped before the Feast of Spes, when Gaea plans to have two demigods sacrificed in Athens. She needs their blood - the blood of Olympus - in order to wake. But how can a handful of young demigods hope to persevere against Gaea's army?