The world unknown

Allie is a seventeen year girl who has lived by herself since her parents were killed in a mysterious car crash. Allie has not been a very popular girl she likes hanging out by her self and has learned to take care of her one day she was walking home and she though she saw someone following her. That when she met a boy who said that her parent said to come get her only she can used her powers to save them. but save them from what?