Guardians of Olympus: Castle of the Damned

Erebus has put phase two of his plan in motion, raising the twisted King Malenios of Athens to kidnap Hailey and sacrifice her to the darkness so that he can destroy Olympus. Reunited in time to see her get kidnapped and with four days to cross the country and save her, Miles Dani Lucas and Roxie try to band together and save their friend and prevent the end of the world