Percy Jackson is forgotten at camp and can only trust Nico, Thalia, Grover, Tyson and Annabeth. But Annabeth forgets him too. Percy is no one on Earth without Annabeth. So he leaves Earth completely.
Ten months after the Giant War, everything is going great. The biggest thing that is happening at Camp Half-Blood is Thalia Grace, Daughter of Zeus chasing Perseus Jackson, Son of Poseidon.
On a completely different planet, the leaders of the Chaos Army learn something new about the Assassin of Chaos.
Now, as a new war starts with Camp Half-Blood in the middle, the Chaos Army comes to help. If only Percy Jackson didn't disappear in the middle of the night again...