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For 15 years, northern California is haunted by a serial rapist until genetic genealogy finally reveals the identity of the elusive sexual predator.
In October 1970, 28-year-old court reporter Nancy Bennallack fails to show up for work, and her colleagues become worried.
40 years after the sexual assault and murder in April 1980 of 20-year-old Robin Brooks in Sacramento, California, determined cold case detectives collaborate with scientists using revolutionary forensic techniques to put her killer behind bars.