Even though the Argo II's Greek and Roman crew members have made progress in their several tasks, they still don't appear to be any closer to overthrowing Gaea, the earth mother. All of her giants have emerged, and they are more powerful than ever. Before the Feast of Spes, when Gaea intends to have two demigods sacrificed in Athens, they must be stopped. For her to awaken, she needs their blood—the blood of Olympus.