When 17-year-old Arya is sent to an isolated hostel in the hills, she expects strict curfews and boring routines. But what she finds is something much darker. The hostel has rules-strange ones. No questions after lights out. Never speak to outsiders. And never, ever try to leave.

The staff smiles too much. The other students whisper when they think no one is listening. And the more Arya digs for the truth, the more the walls seem to close in around her. Something is wrong in this place-but no one will tell her what.

And the scariest part?

Nobody knows what happens to the ones who break the rules