A group of desperate humans battle demonic beasts in an infernal labyrinth & make a terrifying discovery about the true nature of reality Abducted & stuck into a cramped chamber Kate Walker awakens to find herself & 19 strangers trapped in an endless maze of dark caves Later while avoiding deadly traps & fending off hordes of hellions Kate is saved from certain death by a mysterious stranger named Jack Jack has been stuck in these caverns for months & he thinks he&s finally found a way out Before they can escape however Kate & Jack encounter the man responsible for thrusting them into this otherworldly nightmare & learn that the only thing holding these demons in the underworld is the promise that they will always have fresh victims to hunt through the darkness