With his marriage on the rocks and on the verge of getting a divorce, a depressed Assistant Director Skinner meets an attractive blond, Carina Sayles, in a hotel bar and they decide to get a room and spend the night together. When he awakens in the morning however, Carina is laying beside him dead from a broken neck. Scully and Mulder investigate on their own as Skinner would prefer they just mind their own business. When they learn that their boss has been having nightmares of sorts, Mulder believes he is being visited by a succubus, an old woman of legend who takes the life force out of a man. Some in the FBI move quickly to have Skinner removed from his post and it becomes obvious that it's all part of a greater conspiracy.