The Ritual

A group of four friends - Phil, Dom, Hutch, and Luke - embark on a hiking trip on Kungsleden (King's Trail) in Sarek National Park, in northern Sweden, to honor their friend Rob, who was killed six months earlier in a convenience store robbery. After Dom falls and injures his knee, Hutch consults the group's map and decides on an alternate route through the woods that will take them half the time. In the woods, the group begins to encounter unexplained phenomena, including a gutted elk and runes carved on trees. Read more on Wikipedia.