Thomas and Diane Watts are a couple looking forward to a relaxing holiday at a grand Victorian hotel on the Cornish coast. But from the moment they set out on the road, something strange follows them. Thomas catches a glimpse of a little girl's face staring back at him from the rear-view mirror, a face that should not be there. What begins as an unsettling curiosity quickly turns into something far more difficult to brush off.As the weekend unfolds, the mysterious girl keeps appear...