An exploration of the twisted crimes of Joseph James DeAngelo, the Golden State Killer, and the groundbreaking use of familial DNA to crack one of the most chilling cases in modern history.The Golden State Killer case captivated the public and became a true crime phenomenon, spurring documentaries, podcasts like My Favorite Murder, and even TV shows such as Unbelievable and Mindhunter.This book uncovers the behind-the-scenes work that led to the identification of DeAngelo, bringing an end to his reign of terror and changing the process of criminal investigation forever.With thrilling insights into the science of familial DNA, this book is a must-read for fans of Making a Murderer and The Jinx. True crime buffs won't want to miss this deep dive into one of the most astonishing criminal cases of the 21st century, combining cutting-edge forensic science with a truly evil villain.