Underneath the fake blood and cheap masks of countless haunted house attractions across the country, there are whispers of a truly terrifying alternative. Looking to find an authentic, blood-curdling good fright for Halloween, five friends set off on a road trip in an RV to track down this underground Haunt. Just when their search seems to reach a dead end, strange and disturbing things start happening, and it becomes clear that the Haunt has come to them.