Second Soul

Sasha was only four years old when her mother ran away. Her dad doesn't talk about it much, and the only information that she's bribed out of him is that her mother went partially insane. Sasha did remember one thing about her mother, though. A few days before she left, her mother gave her a warning,
"I'm warning you, there is a monster to be afraid of, one that you will never find by searching under your bed or in your closet. It's in your head. Be very very careful not to anger it. No matter what, it will change your life up-side down." but that's all. When she turned six, she found Raina, the second soul in her body.