Deputy Sheriff Jess Delgado is tasked with transporting the sole survivor of a mysterious attack along the Texas-Mexico border to CoreCivil, a for-profit immigration detention center closing down due to wide-spread protests. Housing only a handful remaining detainees and manned by a skeleton crew of disgruntled guards, the detention center becomes a desperate battle ground when something otherworldly emerges from deep below the earth. Something that only fears the light. Deputy Delgado must pull together the guards and detainees two groups that hate and fear each other to survive the night. Or fall to the vengeance of the things that live beneath.