Park Ranger and avid caver Wesley Fischer is on a one-woman mission to stop Stillwater Cave from being turned into a tourist trap, but public opinion is not on her side. When violent locals begin blasting in the cave, Wes and a fellow ranger investigate. A confrontation between both parties spirals into a deadly chase, forcing the two rangers to flee deep under the Kentucky mountains. First to escape pursuers, and then the deadliest threat--the cave itself!