Sister in the mirror

Sylvia was in a car accident A while ago. Her mother and twin sister Alyssa died. But somehow when ever Sylvia looked in a mirror or at water she could see them. Her father thinking she was insane sent her to a school named Hallow for kids that are troubled and mentally ill. Sylvia didn't take it too well. Deciding she was perfectly fine. She blocked the voices out. She blocked out everything. But what happens when she just can't anymore?

By A.R.