Percy is confused‎.‎ When he awoke after his long sleep‎,‎ he didn‎'‎t know much more than his name‎.‎ His brain‎-fuzz is lingering‎,‎ even after the wolf Lupa told him he is a demigod and trained him to fight‎.‎ Somehow Percy managed to make it to the camp for half‎-bloods‎,‎ despite the fact that he had to continually kill monsters that‎,‎ annoyingly‎,‎ would not stay dead‎.‎ But the camp doesn‎'‎t ring any bells with him‎.‎ Hazel is supposed to be dead‎.‎ When she lived before‎,‎ she didn‎'‎t do a very good job of it‎.‎ When the Voice took over her mother and commanded Hazel to use her "gift" for an evil purpose‎,‎ Hazel couldn‎'‎t say no‎.‎ Now‎,‎ because of her mistake‎,‎ the future of the world is at risk‎.‎ Frank is a klutz‎.‎ His grandmother claims he is descended from ancient heroes‎,‎ but he doesn‎'‎t even know who his father is‎.‎ He keeps hoping Apollo will claim him‎,‎ because the only thing he is good at is archery‎.‎ His big and bulky physique makes him feel like a clumsy ox‎,‎ especially in front of Hazel‎,‎ his closest friend at camp‎.‎ He trusts her completely‎-enough‎,‎ even‎,‎ to share the secret he holds close to his heart‎.‎ Beginning at the "other" camp for half‎-bloods and extending as far north as the land beyond the gods‎,‎ this breathtaking second installment in the Heroes of Olympus series introduces new demigods‎,‎ revives fearsome monsters‎,‎ and features other remarkable creatures‎,‎ all of whom are destined to play a part in the most important quest of all‎:‎ the Prophecy of Seven‎.‎