Keep Calm and Carry On
Annabeth Chase, age 17, is a nerdy girl who happened to know Thalia before she left.
Fiona Mulligan, age 17, is a kind, rich girl with serious daddy problems.
Nico di Angelo
Nico di Angelo, age 17, is a moody, curious, short-tempered boy slightly obsessed with finding out Thalia's secrets.
Percy Jackson, age 17, is a slightly oblivious, loyal boy who leads their little "group".
Thalia Grace, age 17, is a short tempered, secretive girl with a past to confront.