When New Zealand Defense Force Sergeant Taine McKenna and his squad are tasked with escorting a bunch of civilian contractors into Te Urewera National Park, it seems a strange job for the army. Militant Tūhoe separatists are active in the area, and with its cloying mist and steep ravines, the forest is a treacherous place in winter. Yet nothing has prepared Taine for the true danger that awaits them. Backtracking toward civilisation, they are stalked by a prehistoric creature intent on picking them off one by one. With their weapons ineffective, the babysitting job has become a race for survival. Desperate to bring his charges out alive, Taine draws on ancient tribal wisdom. Will it be enough to stop the nightmare? And when the mist clears, will anyone be left?