Ghost in the Machine — Les Martin

A computer-run building operations system goes awry'killing the company CEO and the FBI investigator assigned to the case. Mulder and Scully's preliminary investigation shows that only one person has the technical know-how to override the system: Brad Wilczek, the high-strung young computer whiz who created the program. But is Wilczek the driving force behind the havoc? Or has the Central Operating System developed a malevolent mind of its own . . ?