When teens Llianna Adank and Eric Goldstrand are found shot to death at an Oregon park in 1977, every parent's nightmare comes true. Detectives doggedly pursue leads for 40 years until a single piece of evidence leads them to a suspect 3 states away.

When the blood-smeared car of 27-year-old Stefanie Watson is found in a Maryland parking lot her family hold out hope she's still alive. But when a jawbone is dumped in a local neighborhood, a missing persons investigation becomes a murder.