A group of women, best friends, heads over to a remote place in Scotland to have an adventure together. They all have their fair share of problems in the real world and want to forget about all that for a moment out here in the wilderness. The ladies decide to go hiking and accidentally get trapped in a cave. It's almost impossible to survive in a maze-like place without the proper equipment. There isn't enough oxygen under the ground, and the labyrinth is home to some dangerous creatures hungry for blood. The deep holes and narrow passages leave them no room to hide. Away from civilization, trapped inside a scary cave, the heroines will have to act as one if they hope to survive this nightmare and make it back alive.