Mulder coerces Scully into taking a detour by Elko, Nevada on a hunch that this may be an X-File. Once there, however, Mulder manages to get himself kidnapped by Crump, who has escaped from the police. Mulder realizes that Crump is in a considerable amount of pain and that the only way to ease the pain is to drive west. Scully investigates the Crumps home and discovers that an antenna array emitting ELF waves stretches beneath their property. She deduces that an abnormal surge in these waves somehow caused a rising pressure in the inner ear of the nearby inhabitants.
Westward motion seems to be the only thing to help the ease the pain of the increasing pressure.
Mulder explains to Crump that Scully will meet them at the end of the highway. There she will insert a needle into Crump's inner ear, hopefully relieving the pressure. But when Mulder arrives, it is too late. Crump has already died.