A serial killer, Wayne, is driven by numerology. He occasionally confronts and has enigmatic conservations with Mr. Burt, a guy who sits around, plays games, and dispenses confusing "advice". Monica latches onto the numerology aspect of the killings. She and Scully eventually figure out where Wayne is, only to be locked in a parking garage with Mr. Burt while Wayne apparently escapes. Mr. Burt dispenses more enigmatic advice, reveals his collection of music CDs (i.e., music reduced to 0s and 1s in binary, i.e., more numbers), makes jokes, dances, and beats them at checkers. Thanks to the checker game, they figure out that Wayne's pattern is killing blonde, brunette, and redhead women, and then starting over again. Since the last victim was blonde, they figure they're next (brunette and redhead = black and red on the checkerboard = red-headed Scully and brunette Monica) and that Wayne must still be in the parking garage. Thanks to Doggett's arrival Wayne is shot and killed, and Mr. Burt disappears as mysteriously as he came, leaving the people outside the building to break into an Italian musical number.