American horror in which siblings Trish and Darry Jenner (Gina Philips and Justin Long) accidentally discover an underground cavern full of damaged body parts and soon find themselves running for their lives. They plead the police for help but when two officers drive out to take a look at the cavern, they quickly become the victims of a supernatural assailant known as the Creeper (Jonathan Breck). Trish and Darry then flee to the safety of a nearby house, but the Creeper is on their trail and refuses to give up the chase.