After the mysterious death of a reclusive relative you barely knew—a great-uncle or grandfather—you receive notice that you've inherited a large, rural property. The centerpiece of it is an old, weathered barn surrounded by overgrown fields and a rusted-out chain-link fence. From the outside, the barn looks abandoned. But once inside, you discover it’s been heavily reinforced from within. Beneath a false floor lies a concealed elevator that descends into an enormous underground facility.