The Last Olympian (Percy Jackson and the Olympians, #5)(Paperback Edition)
by Rick Riordan
Everyone's favorite demigod child, Percy Jackson, returns for the final epic battle to ensure the safety of Mount Olympus, in Percy Jackson and The Last Olympian. After Percy learns that he is the son of Poseidon, his world turns upside down. A prophecy states that when he reaches the age of 16, he will have to make a choice that will affect the future of Olympus.
The book opens with Percy and Beckendorf trying to destroy Kronos ship and defeat him before he reaches Olympus. Not one to be outsmarted, Kronos is in possession of Luke's body, the son of Hermes. Percy learns of the prophecy while at his father's underwater palace. to prepare for the battle, Percy dips himself in the famed River Styx. When he returns, he finds that all the residents of Manhattan have been put to sleep by Kronos, so that they do not get in the way of the battle.