The true story of the nation's most prolific uncaught serial killers responsible for 51 attacks and 12 murders.

Delves 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 centres, 911 emergency services and DNA collection laws.

An exploration of how both the crime scenes and the serial behaviours of perpetrators leave clues about their identity for investigators to find.

Investigators dive into the evidence and theories surrounding the Golden State Killer's identity, and what job could have allowed him the time to commit his crimes.

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