A group of American young people travels to Ireland to go from camping to a small forest of the zone. The idea is to go in search of hallucinogenic mushrooms and to spend days placed. One of the young people, Tare (Lindsey Haun), is mistaken of mushroom and takes one that could get to be mortal. Luckily it does not pass anything to him, but it gains the power to see the future. At night, Jake (Jack Huston), only the native one, explains the history to them of a massacre that was in a house not far from there. Tare dreams about all the deaths of its companions, and one by one they are dying... She will try to stop the culprit.