Serial Killers True Crime Science

Understand history's most enigmatic serial killer. In December of 1968, a serial killer began orchestrating a campaign of terror in the San Francisco Bay Area. Not satisfied with the simple act of murder, he taunted law enforcement and the public by writing letters to local newspapers. Through often cryptic and bizarre content - including four ciphers, three (now two) of which have never been solved - the psychopath played a twisted game. Reporters dubbed the man the "Cipher Killer", but the murderer chose a different name for himself: the Zodiac.

David Berridge has spent 28 years working as a prison officer, with 22 years at Parkhurst. A tough character with a big personality and a dark sense of humour, David has had to deal with it all - serial killers and gangsters, terrorists and sex offenders, psychopaths and addicts. Inside Parkhurst is his raw, uncompromising look at what really went on behind the massive walls and menacing gates of one of Britain's highest security prisons.