HEROES OF OLYMPUS, V.2 - THE SON OF NEPTUNE

In 'The Lost Hero,' the previous edition, three demigods named Jason, Piper, and Leo made their first visit to Camp Half-Blood, where they inherited a quest. Who are the other four mentioned in the prophecy? 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.