There's a new coldness. A shift in the atmosphere. The prickling feeling that someone is watching her every move from the shadows. I'm in your head. Maybe it's all in Elle's mind? She's a writer - her imagination, after all, is her strength. And yet every threat seems personal. As if someone has discovered the secrets that keep her awake at night. As fear and paranoia close in, Elle's own home becomes a prison. Someone is unlocking her past - and she's given them the key.