A family is torn apart when the stepfather's PTSD appears to develop into something far more sinister...and possibly even supernatural. Horror Finally a great British horror, although the budget was not huge, the movie was shot absolutely fantastically, the actors portrayed each character so well. The story is a great possession horror, which shows if someone is mentally weak they are susceptible to the dark forces to overcome them. Hats off to the director for a great story which shows the background story was well researched.