The Son of Neptune

The Son of Neptune is the second book in the Heroes of Olympus series, set to be released in Fall 2011, and was revealed on page 557 of the First American Edition Hardback copy of The Lost Hero.

"The Son of Neptune", (Roman equivalent of Poseidon) most likely refers to Percy Jackson, the main protagonist of the Percy Jackson and the Olympians series. Percy did not appear in the first book, The Lost Hero, due to the fact that he had gone missing or possibly had been kidnapped, three days prior to the beginning of the book. By the end of The Lost Hero, it is revealed that he has been swapped with Jason by Hera (Greek equivalent to Juno), and is now at the Roman equivalent of Camp Half-Blood. It is likely that he is unaware of his identity, just as Jason Grace was.