After a teenager disappears, officers track, interrogate and tail the man he was last seen with.

Officers excavate the crawl space beneath Gacy's home; Gacy shows where he disposed of Rob's body.

As police make a shocking discovery, the media circus begins; two teens navigate boyhood in Uptown.

A psychiatrist interviews Gacy; Tovar and Kozenczak uncover systemic failures; teenage love unfolds.

A blizzard buries Chicago; Kozenczak tracks down Gacy's surviving victims; a teen learns sex work.

In the past, Gacy confesses to Sam how he groomed, sexually assaulted and killed boys and young men.

Tovar drives Gacy to court hoping to uncover his kill count; Gacy's grooming of Cram is revealed.

Jeffrey Rignall's story is told; Gacy's execution day brings protests, reunions and moral debates.