All year the half-bloods have been preparing for battle against the Titans, knowing the odds of victory are grim. Kronos x2019;s army is stronger than ever, and with every god and half-blood he recruits, the evil Titan x2019;s power only grows. While the Olympians struggle to contain the rampaging monster Typhon, Kronos begins his advance on New York City, where Mount Olympus stands virtually unguarded. Now it x2019;s up to Percy Jackson and an army of young demigods to stop the Lord of Time. In this momentous final book in the "New York Times" best-selling series, the long-awaited prophecy surrounding Percy x2019;s sixteenth birthday unfolds. And as the battle for Western civilization rages on the streets of Manhattan, Percy faces a terrifying suspicion that he may be fighting against his own fate.