The Last Olympian. Percy Jackson and the Olympians #5 - Rick Riordan

The Last Olympian is the 5th book in the Percy Jackson and the Olympians Series. Most people get presents on their sixteenth birthday, I get a prophecy that could save or destroy the world. It happens when you're the son of Poseidon, God of the Sea. According to an ancient prophecy, I turn sixteen and the fate of the entire world is on me. But no pressure. Now Kronos, Lord of the Titans, is beginning his attack on New York City. And the dreaded monster Typhon is also heading our way. So it's me and forty of my demigod friends versus untold evil...