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In 1995, a masked man commits a series of sexual assaults at knifepoint. It takes more than 20 years for this serial rapist to be identified and then brought to justice.
In 1981, a high school student is found dead on the side of a road. Police work tirelessly on the case until new DNA technology exposes the killer.
In Alexandria, Virginia in 2016 a young female lifeguard is raped while working at a local pool. Police learn of a similar incident in Fairfax, Virginia 2 years earlier. It takes ground-breaking genealogy tools to find the perpetrator.