Heroes of Olympus, The, Book Two: The Son of Neptune-Heroes of Olympus, The, Book Two

Three demigods named Jason, Piper, and Leo made their first visit to Camp Half-Blood, where they inherited a quest. But who are the other four mentioned in the prophesy? The answer may lie in another camp miles away, where a new camper has shown up and appears to be the son of Neptune, god of the sea.