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.
Mulder talks Scully into investigating a haunted house on Christmas Eve where several couples have met their fate on that very night. While there, they encounter endless tricks and traps set by a ghostly couple who originally made a lovers suicide pact in the house. The ghosts try to convince Mulder and Scully to kill each other.