The Seventh grade has been surprisingly quiet for Percy Jackson. Not a single monster has set foot on his New York prep-school campus. The unexpected arrival of his friend Annabeth brings bad news: the magical borders that protect Camp Half-Blood have been poisoned by a mysterious enemy, and unless a cure is found, the only safe haven for demigods will be destroyed. Percy and his friends must journey into the Sea of Monsters to save their camp. But first, Percy will discover a stunning new secret about his family, one that makes him question whether being claimed as Poseidon's son is an honor or simply a cruel joke.