The fifth and final book in The Heroes of Olympus series
The Greek and Roman crewmembers of the Argo II have made
progress in their many quests, but they still seem no closer to
defeating the earth mother, Gaea.
Her giants have risen, and they're stronger than ever. 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.