In 1976-77 four young people were kidnapped and murdered near Detroit. Dubbed the Oakland County Child Killer, it sparked the biggest manhunt in US history.

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.

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.

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.