The Son of Neptune: The Graphic Novel (Heroes of Olympus Book 2) : Paperback : Penguin Random House Children\'s UK : 9780141370507 : : 23 Feb 2017 : The bestselling Heroes of Olympus title by Rick Riordan - now in stunning graphic novel form! Percy Jackson, son of Poseidon, has come face to face with two snake-haired ladies who refuse to die. But they\'re the least of his problems. Because Percy finds himself at a camp for half-bloods, which doesn\'t ring any bells for him. There\'s just one name he remembers from his past. Annabeth.