Percy Jackson isn't feeling very heroic. The half-human son of Poseidon - the Greek god of the sea - once saved the world, but Percy's starting to think that might have been a fluke. Is he a flash in the pan a one-quest wonder? When Percy learns he has a half-brother who's a monster, he wonders if being the son of Poseidon might be more of a curse than a blessing. But Percy doesn't have much time to brood; the magical borders of Camp Half-Blood are beginning to fall and a horde of mythical monsters threatens to destroy the sanctuary for the children of the gods. In order to save the demigods' haven, Percy and his friends must find the fabled and magical Golden Fleece. Their journey takes them to Washington, D.C. and on to the Florida coast, where they set sail on a treacherous odyssey into the uncharted, deadly waters of the Sea of Monsters, known to humans as the Bermuda Triangle. They are challenged by a giant mechanical fire-breathing bull, terrifying sea creatures, a gigantic Cyclops, and other demigods of uncertain allegiances. The stakes are higher than ever and if Percy doesn't succeed, Camp Half-Blood will cease to exist and all of Olympus will crumble.