Percy Jackson and the Olympians, Book Five : The Last Olympian

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All year the half-bloods have been preparing for battle against the Titans, knowing the odds are against them. Kronos is stronger than ever, and with every god and half-blood he recruits, his power only grows. In this momentous final book in the New York Times best-selling series, the 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.