Do you ever feel that prickle on the back of your neck, as though someone's watching you? Someone is watching Hannah. Her name is Ruby, and her job as CCTV operative means she can follow Hannah everywhere she goes. It's against the law, but Ruby is willing to do whatever is necessary to keep Hannah safe. And there's no harm in just watching. Until just watching isn't enough. So the next time you get that feeling, and you think you're alone - think again.