As Michelle's loved ones cope with her sudden death, her work to unmask the Golden State Killer lives on. Inspired by McNamara's interest in genealogy and online DNA testing services, Paul Holes, Chief of Forensics in Contra Costa County, reconstructs the killer's family tree with the help of genetic genealogist Barbara-Rae Venter. After inheriting Michelle's 37 boxes of case files, researcher Paul Haynes and true crime writer Billy Jensen work alongside Michelle's husband, Patton Oswalt, to finish her book, which becomes an instant bestseller. Meanwhile, the release of Michelle's autopsy report rocks her inner circle. Michelle's writing - in which she wrestles with depression and her own mother's sudden death - sheds light on her pain but leaves many questions unanswered.