Before the battle begins, New York City is silenced by way of a powerful sleeping spell from Morpheus, the god of dreams, that puts all mortals to sleep. He believes that she could have stopped the war by helping Luke before he was possessed, saying he would have listened to her.

They enter Olympus through the Empire State Building to prepare and meet Hermes, who is furious with Annabeth. The campers, alongside Chiron, arrive and Percy organizes them (except for the Ares cabin, who refused to fight), and prepares them for an urban battle. Percy calls Annabeth and tells her it's time for the battle to begin. The two boys then follow through with the original plan, which was for Percy to bathe in the River Styx and gain Achilles' power.Percy emerges from the Underworld in New York City, leaving a very depressed Nico behind. Here, Nico betrays Percy for information on his past, but then helps Percy to escape from confinement. After visiting Luke's mother in Westport, Connecticut, and talking with Hestia, goddess of the hearth and home, Percy procures a blessing from his mother, which will allow him to descend into the Underworld for the second time. Soon after arriving, Percy leaves again with Nico di Angelo, son of Hades, to find out Nico's plan for Percy to survive the battle, as mentioned at the end of The Battle of the Labyrinth. Percy wants to stay and help fight with his father, but Poseidon sends Percy back to Camp Half-Blood.At Camp Half-Blood, Chiron decides it is time for Percy to hear the 'Great Prophecy.' Percy informs the camp that there is a spy among them, someone who has been informing the Titans for years, but they put it aside until the bigger issues at hand are dealt with, such as the impending war against Kronos. He finds that he is in his father Poseidon's underwater palace, which is under siege by the forces of the Titan Oceanus.

Percy is awakened by his half-brother Tyson, the cyclops. However, Kronos, still possessing Luke Castellan, is not caught off guard because of a spy at Camp Half-Blood, and Beckendorf sacrifices his life to destroy the ship, while Percy dives overboard and passes out from contact with Kronos' scythe when battling him on the ship. About book: In order to try to cut the head off of Kronos' approach by sea, Percy and Beckendorf, the son of Hephaestus, attempt to destroy his ship, the Princess Andromeda.

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