The final book in the Percy Jackson series:
"Most people get presents on their sixteenth birthday. I get a prophecy that could save or destroy the world."
The demigods must band together to protect New York City from the impending arrival of Kronos, Lord of the Titans, and the giant monster Typhon. Meanwhile, Percy struggles with the weight of a prophecy that will decide the fate of the entire world.
Rick Riordan - Percy Jackson and the Last Olympian