Two pregnant women, Laci Peterson and Evelyn Hernandez, are found dead in the SF Bay. Is there a connection? Rumors of a satanic cult swirl.

Chandra Levy and Joyce Chiang, two young women tied to DC power circles, vanish and are found murdered. Is there a serial killer at work?

Predators known as the Craigslist Killer and the Tagged Killer, use social media to hunt. One survivor shares her story.