A blizzard buries Chicago; Kozenczak tracks down Gacy's surviving victims; Kunkle and Kozenczak attempt to break Gacy's accomplice, David Cram; Billy Carroll introduces Dale Landingin to the lucrative, but sometimes dangerous world of sex work.

Kunkle and Sam are knee-deep in Gacy's trial; Tovar volunteers to drive Gacy to and from court, attempting to compel him to come clean about how many he killed; the disturbing tale of how Gacy befriended and groomed David Cram is revealed.