Serial killers come in all shapes and sizes, but this one is particularly puzzling. There's no pattern to the mutilated bodies that have been showing up in Albuquerque: both sexes, all races, ages, ethnic groups. There is no evidence of rape or ritual. Only one thing connects the victims. They were the victims of a natural disaster. One of the most unnatural natural disasters imaginable, leading to a most painful, most certain and most hideous death....

Mulder and Scully, FBI: the agency maverick and the female agent assigned to keep him in line. Their job: investigate the eerie unsolved mysteries the Bureau wants handled quietly, but quickly, before the public finds out what's really out there. And panics. The cases filed under "X."