" is the fourth episode of the fourth season of The X-Files
. Agents Mulder
investigate a group of bizarre abductions in which the only clues are inexplicable photographs. But, when Scully is the next intended victim, Mulder must get into the killer's head.
- Unruhe means "unrest" in German, and is mentioned many times throughout the episode.
- Vince Gilligan said the inspiration for the episode's title came from spree killer Howard Unruh, whom he had read about as a child. Gilligan was always struck by the fact that Unruh's name was German for "unrest".