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The amateur DNA sleuth who cracked the most infamous cold case in American history -- that of the Golden State Killer - tells the incredible true story of how she did it, and explains how her methods have changed the course of criminal investigations forever.For twelve years he terrorized California, stalking victims and killing without remorse. Then he simply disappeared, for the next forty-four years, until an amateur DNA sleuth opened her laptop. In I Know Who You Are, Barbara Rae-Venter reveals how she went from researching her family history as a retiree to hunting for a notorious serial killer - and how she became the nation's leading authority on investigative genetic genealogy, the most dazzling new crime-fighting weapon to appear in decades.