Theresa – a policewoman investigating a helicopter crash, finds herself in Kahukura, a New Zealand settlement that on first appearances is relatively calm and beautiful. However, as soon as she arrives, a wave of violence and madness hits the town – with the locals intent on destroying both themselves and each other. As the wave of madness passes, it becomes clear that there is a field surrounding the town – trapping the survivors inside. They must work together to grieve, come to terms with what they have done, and to find a way out of the situation. As the madness threatens to return, the fear that the violence may return becomes an increasing reality…