Criminal psychologist Kate Fuller is assigned to the murder of a man who has seemingly been strangled in his sleep by his wife; the only witness is their eight-year-old daughter Sophie. As Kate digs into the mystery of an ancient demon which kills people in their sleep, she experiences the same petrifying symptoms as all previous victims and spirals through a chilling nightmare to save herself and Sophie before she dares fall asleep again.

Criminal psychologist Kate Fuller is assigned to the murder of a man who has seemingly been strangled in his sleep by his wife and the only witness is their eight-year-old daughter, Sophie. As Kate digs into the mystery of an ancient demon which kills people in their sleep, she experiences the same petrifying symptoms as all previous victims and spirals through a chilling nightmare to save herself and Sophie before she dares fall asleep again.

A tournament is watched by dozens of wealthy men betting on which one of the 30 assassins will survive the next 24 hours "kill or die" and claim the USD10,000,000 prize. It takes place in an English town with plenty of CCTVs.