FBI agents Mulder and Scully take on a radioactive case in this eerie thriller by the New York Times–bestselling author . . .

Dr. Gregory, a renowned nuclear weapons researcher, is not only dead—he's been charred to a radioactive cinder.

Since this is a death on Federal property, Mulder and Scully are hastily called in. As FBI agents who specialize in unexplained phenomena, they are the investigators of the X-Files, strange and inexplicable cases which are also mysteries that the FBI doesn't want solved.

When a second victim, completely unrelated to nuclear science or Dr. Gregory, is obliterated in the New Mexico desert, and then a third dies the same way in Washington, DC, Mulder and Scully begin to focus on the frightening dimension of their task. The bizarre deaths cannot be a coincidence. And as they work to uncover the secret unifying element that unites these deaths, it becomes clear that this twisted puzzle has fatal consequences for the entire world . . .