DescriptionPercy Jackson and the Last Olympian is the fifth awesome adventure in Rick Riordan's top-ten bestselling series. Half Boy. Half God. ALL Hero. 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.