Guy in the Shadows

Natalie Rose is just like every other teenage girl her age. Except she has a tiny little secret that can destroy the very life she has. She has a stalker. She's had him for five years and he still hasn't made a move. She doesn't know what he wants or how to get him to go away, but she does know one chilling fact about her stalker. Nobody but Natalie can see him.
Now juggling an invisible stalker and keeping him a secret, a new problem arises. Her sister, Eileen, who just turned ten, has another secret and possibly the key to why Natalie is being stalked. And the answer maybe far more chilling than the stalker himself.