For 12 years, the Golden State Killer terrorized California, and then mysteriously seemed to disappear. Forty-three years after his crime spree began, Barbara Rae-Venter received an unexpected call from a cold-case investigator taking one last shot at the case before he retired. Intrigued by the challenge, it took Rae-Venter just 63 days to crack the case and identify the serial rapist and murderer.

In her new book I Know Who You Are, Rae-Venter reveals how she went from a retiree researching her family history to hunting for this notorious serial killer. Through her relentless curiosity, she became one of the nation’s leading authorities on investigative genetic genealogy, the most dazzling new crime-fighting weapon to appear in decades.

Hear how she approaches trying to solve cold cases and explains how her methods have changed the course of criminal investigations forever.