The prologue tells the cause of the death of the sisters Beth and Hannah. There's a harsh jump-cut to a year later. We will then follow eight young friends who, invited by the dead girls' brother, go back to the lodge where everything happened. Tensions rise as we get to the Blackwood Mountain, and soon we discover there's a mysterious figure wandering around, along with a cruel prank and something darker awakening beneath them. Their help isn't coming, not until dawn.
