All year long, Percy Jackson and the Half-Blood camp had been preparing for battle against the Titans. While the Olympians hold off the monster Typhon, the enemy led by Kronos launches an offensive on Manhattan — the defense of Mount Olympus now depends on Percy Jackson and the half-bloods. But will they have the strength to stop the Time Lord himself? After all, the great prophecy does not bode well, and when the battle does not unfold according to plan, Percy begins to suspect that perhaps he is really destined to end this war as the hero of the prophecy — sacrificing his own life for the sake of others.