The Blood of Olympus (The Heroes of Olympus, Book 5)

The final book in Rick Riordan's Heroes of Olympus series concludes the story of the Greek and Roman demigods aboard the Argo II. Despite their progress on multiple quests, they remain unable to defeat Gaea, the earth mother, whose giants have all risen and grown stronger. Gaea plans to sacrifice two demigods in Athens during the Feast of Spes, using their blood—the blood of Olympus—to awaken fully. The demigods experience frequent visions of a major battle at Camp Half-Blood. Meanwhile, the Roman legion from Camp Jupiter, commanded by Octavian, approaches rapidly. The group faces a difficult choice: the Athena Parthenos, a massive statue that could serve as a weapon, must be returned to Long Island to prevent war between the two camps, while the Argo II heads toward Athens. With the gods rendered ineffective by their condition, the young demigods must find a way to stand against Gaea's army of giants. Though the journey to Athens is perilous, they have no alternative. Having already sacrificed much, they must act—or face total defeat if Gaea awakens.