Mulder and Scully investigate a series of murders in which the victims appeared somewhere else as Monochrome Apparitions as they were killed.
Benevolent Boss: Pintero who is extremely kind to Harold and even backs him when he is accused of being a serial killer.
Call-Back: Scully goes to see the FBI employees' therapist who appeared in "Irresistible".
Hair of Gold, Heart of Gold: The serial killer targets very young beautiful women who all have blond hair and who were very kind. They were also friends with a mentally handicapped man who was in love with them.
I See Dead People: That is the X-file. People report seeing wounded women who seem silently asking for help in strange places where they actually never appeared while they lived with the ominous message "s/he is me". It turns out the apparitions happened very close to the moment of their actual death.
Jacob Marley Apparel: The ghosts of the girls and women are seen with their wounds that caused their deaths and in clothes they were wearing when they died.
Neurodiversity Is Supernatural: Harold has Pervasive Developmental Disorder (also referred to in the episode by its old name, "Atypical Autism"); he was portrayed quite realistically despite his connection to the paranormal.
Serial Killer: A rare female example of the trope who targets young and nice women.