Susan wakes up alone in a room she doesn't recognise, with no memory of how she got there. She only knows that she is trapped, and her daughter is missing. The relief that engulfs her when she hears her daughter's voice through the wall is quickly replaced by fear. The person who has imprisoned her has her daughter, too. Devising a plan to keep her daughter safe, Susan begins to get closer to her unknown captor. And suddenly, she realises that she has met him before.
