The girl in the cabin next door

Tiffany has an drunken and abusive father, Edward Smith. Her mother, Jade Riddle, was kill in a accident, Tiffany's little sister Luna were never wanted.
This is year after 'Blood of Olympus'. Luna finds out that she is child of Hades, but neither Tiffany nor Luna knows why Karlie takes BOTH them to camp half-blood. Karlie said that Hera (goddess of marrige) told her to come get them, both. Tiffany must find the truth that Hera and Poseidon are keeping from Zeus, and will Hades stand up from them? There are other problems Tiffany will face at camp half-blood, she will have to solve them by herself.