Percy Jackson has defeated Kronos. The seven have slain the Giants. Apollo has restored Delphi. But now an even greater evil has arisen. Eris, goddess of strife, is instructed by Chaos to create as much hate as possible. Demigods must fight as Tartarus unleashes monsters all over the world. Rachel utters her prophecy, then falls into a coma. It's up to The son of Eos, goddess of the Dawn, to save the world. Just one problem. He hates his fellow demigods, Olympians, and prefers the company of monsters. He's been fighting his fellow demigods since Kronos began recruiting.