Old college friends Luke (Rafe Spall), Hutch (Robert James-Collier), Phil (Arsher Ali) and Dom (Sam Troughton) – decide to take a hiking trip deep in the Swedish wilderness in order to bond and reminisce about old times. However, they soon find themselves hopelessly lost in the dense woods and, as night closes in they become increasingly desperate to escape the woods. But they are not alone. Someone, or something, malevolent is watching them, intent on making them face their deepest fears and ensuring they never leave.