“True crime” has evolved as a genre over the past several decades, and in the early days of the Internet Michelle McNamara was one of the first to blog about it. She became fascinated by the Golden State Killer, and specifically the question: If this murderer was so prolific for so long, and left behind so much evidence, why didn’t anyone ever catch him? This documentary series strives to answer that question, based on the extraordinary research McNamara did for her book. Many, many surprises await the viewer.