After teenager Robert Piest disappears on his mother's birthday, Des Plaines Police Department officers track, interrogate and tail the contractor Piest was last seen with -- John Wayne Gacy.

Officers excavate the crawl space beneath John Wayne Gacy's home; Gacy shows Amirante, Kunkle and Kozenczak where he disposed of Rob's body; Johnny Szyc and his best friend, Lynn, venture into Uptown.

The media circus begins; Amirante questions whether defending Gacy is the right choice; the Piests cope with the reality of what Gacy did to Rob; Sam Stapleton and Randy Reffett navigate boyhood in Uptown.