It waits. They came for adventure - a day of exploring the caverns and underground vistas of an abandoned tourist trap known as The Devil's Catacombs. But something waits in the permanent night, something that knows their weaknesses, their desperation. Something primordial that can manipulate their minds and distort reality. Suddenly lost in a world of silent darkness, five friends struggle against an unknown horror that feeds off their fear and grows stronger as it consumes them one by one. To see daylight again, they must summon the courage to overcome evil - including the demons within themselves - and fight their way to the surface. Or die trying.