Devil in Disguise: John Wayne Gacy

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.