When a documentary filmmaker sets out to tell the story of one of the biggest serial killer cases in California history, he uncovers a terrifying tale that begins in 1984 with the disappearance of San Francisco resident Paul Cosner. As investigators search for Cosner, they discover Leonard Lake’s cabin, where among buried human remains they find Lake’s recorded manifesto. When Lake’s accomplice, Charles Ng, flees the country, a manhunt ensues and the fight for justice begins.