Dark Secrets, book 2: Battle of Echidna

SEQUEL TO DARK SECRETS. PREVIOUSLY "CASPIAN DAUGHTER OF POSEIDON". With Ella's twin brother back safe and a fun summer of training at camp half blood ahead, nothing can go wrong right? No such luck. Seriously, did you expect anything better? Rachel has another prophecy that sends the duo and their demigod friends on another quest, and this time not everyone may come back alive.