2. Episode 2

Decades after four children were murdered, Detroit detective Cory Williams hunts for the Oakland County Child Killer, and a survivor visits the pornography mill on North Fox Island.

3. Episode 3

Frustrated by decades of police silence, one victim's family puts the case back on the front page and Detective Williams gets a big break in the search for the killer.

4. Episode 4

Detectives follow new leads from old evidence, while frustrated families hope new science and old-fashioned genealogy will finally reveal who killed the four children of the snow.