All year the half-bloods have been preparing for battle against the Titans, knowing the odds of victory are grim. Kronos s army is stronger than ever, and with every god and half-blood he recruits, the evil Titan 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 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 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.