The exploits of FBI Special Agents Fox Mulder and Dana Scully who investigate X-Files: marginalized, unsolved cases involving paranormal phenomena. Mulder believes in the existence of aliens and the paranormal while Scully, a skeptic, is assigned to make scientific analyses of Mulder's discoveries that debunk Mulder's work and thus return him to mainstream cases.
A alien abduction of two teenagers with endless versions of the same story prompts a science-fiction novelist to to write a book about the incident; however, nobody involved with the investigation can tell him the full story with any accuracy.