The true story of one of the nation's most prolific uncaught serial killers; known first as the East Area Rapist, then the Original Night Stalker, and now the Golden State Killer, he's responsible for a staggering 51 attacks and 12 murders.

Delving into the sadistic methods of the Golden State Killer, one of the worst serial killers of all time, who managed to get away with 51 attacks and 12 murders while assaulting people inside their own homes.

The true story of how one serial killer wreaked havoc in California, leading to new laws and influencing rape crisis centers, 911 emergency services and DNA collection laws.

When dealing with a serial rapist and killer, it's not only the crime scenes that are revealing, it's also the serial behaviors that offer clues of the offender's identity.

Investigators analyze evidence and explore the various theories as to the identity of the Golden State Killer, what job could have afforded him the time to perpetrate his heinous crimes, and where he could he have possibly lived.

After a 40-year manhunt, investigators finally find their needle in a DNA haystack and unmask the man who may be California's most prolific serial killer.