Four 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, the inexperienced hikers soon find themselves hopelessly lost, and as their fragile friendships begin to crack and old resentments surface 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. They should have gone to Vegas...